Method and apparatus for sending uplink/downlink scheduling information, and method and apparatus for receiving uplink/downlink scheduling information

ABSTRACT

A method and an apparatus for sending uplink/downlink scheduling information, and a method and an apparatus for receiving uplink/downlink scheduling information are provided. The method for sending downlink scheduling information includes: determining, in downlink subframes on a second carrier, a first downlink subframe, in which at time corresponding to the first downlink subframe, a subframe on a first carrier is an uplink subframe; and sending, on a fifth downlink subframe on the first carrier, downlink scheduling information corresponding to the first downlink subframe on the second carrier to a terminal, in which time corresponding to the fifth downlink subframe is prior to the time corresponding to the first downlink subframe. The present invention achieves the purpose of performing uplink and downlink scheduling on a second carrier through a first carrier bearing a PDCCH.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/340,421, filed on Nov. 1, 2016, which is a continuation of U.S.application Ser. No. 13/956,899, filed on Aug. 1, 2013, now U.S. Pat.No. 9,504,054. The U.S. application Ser. No. 13/956,899 is acontinuation of International Application No. PCT/CN2012/070828, filedon Feb. 1, 2012, which claims priority to Chinese Patent Application No.201110034427.X, filed on Feb. 1, 2011 and Chinese Patent Application No.201110320442.0, filed on Oct. 20, 2011. All of the afore-mentionedpatent applications and patents are hereby incorporated by reference intheir entireties.

TECHNICAL FIELD

Embodiments of the present invention relate to communicationstechnologies, and in particular, to a method for sending downlinkscheduling information, a method for receiving downlink schedulinginformation, a method for sending uplink scheduling information, amethod for receiving uplink scheduling information, an apparatus forsending downlink scheduling information, an apparatus for receivingdownlink scheduling information, an apparatus for sending uplinkscheduling information, and an apparatus for receiving uplink schedulinginformation.

BACKGROUND

In an LTE Release 8 (R8) system, a base station and a terminalcommunicate and transmit data on a carrier. The terminal scheduled bythe base station can have its own physical downlink control channel(Physical Downlink Control Channel, PDCCH for short) in each subframe.Information carried in the PDCCH can be a downlink_grant(Downlink_grant, DL_grant for short) or downlink_Assignment(Downlink_Assignment, DL_Assignment for short), and the DL_grant orDL_Assignment carries scheduling information indicating time frequencyresource assignment and the like of a physical downlink shared channel(Physical Downlink Shared Channel, PDSCH for short). The informationborne in the PDCCH can also be an uplink grant (Uownlink_grant, UL_grantfor short) or uplink_assignment (Uplink_Assignment, UL_Assignment forshort), and the UL grant or UL_Assignment carries scheduling informationindicating time frequency resource assignment and the like of a physicaluplink shared channel (Physical Uplink Shared Channel, PUSCH for short).The terminal receives and decodes a PDCCH in a corresponding PDCCHsearch space, and correspondingly receives downlink data PDSCH or sendsuplink data PUSCH. Afterward, the terminal feeds back an uplink ACK/NACKfor the downlink data, or the base station feeds back a downlinkACK/NACK for the uplink data, and the downlink ACK/NACK is also called aphysical HARQ indicator channel (Physical HARQ Indicator Channel, PHICHfor short).

In a time division duplexing (Time Division Duplexing, TDD for short)system, both transmission and reception are completed at different timeof a same frequency band, namely, the uplink and the downlink aredistinguished based on time. An LTE system can support seven differentuplink and downlink subframe configurations, and which uplink anddownlink subframe configuration is specifically adopted can be notifiedto the terminal through a broadcast message.

However, when a PDCCH corresponding to one carrier is sent on the othercarrier, if uplink and downlink configurations of the two carriers arenot the same, the type of a subframe on the one carrier and that of asubframe, at the same time as that of the one carrier, on the othercarrier may be different, and downlink scheduling information or uplinkscheduling information on the one carrier cannot be sent on a subframecorresponding to the other carrier, so uplink and downlink schedulingcannot be performed, through the other carrier bearing a PDCCH, on theone carrier bearing no PDCCH.

SUMMARY

Embodiments of the present invention provide a method for sendingdownlink scheduling information, a method for receiving downlinkscheduling information, a method for sending uplink schedulinginformation, a method for receiving uplink scheduling information, anapparatus for sending downlink scheduling information, an apparatus forreceiving downlink scheduling information, an apparatus for sendinguplink scheduling information, and an apparatus for receiving uplinkscheduling information, which are used to solve the defect in the priorart that when an uplink and a downlink are configured with differentcarrier aggregation, uplink and downlink scheduling cannot be performedon a second carrier bearing no PDCCH through a first carrier bearing aPDCCH.

According to an aspect of the present invention, a method for sendingdownlink scheduling information is provided, and includes:

determining, in downlink subframes on a second carrier, a first downlinksubframe, in which at time corresponding to the first downlink subframe,a subframe on a first carrier is an uplink subframe; and

sending, on a fifth downlink subframe on the first carrier, downlinkscheduling information corresponding to the first downlink subframe onthe second carrier to a terminal, in which time corresponding to thefifth downlink subframe is before the time corresponding to the firstdownlink subframe.

According to another aspect of the present invention, an apparatus forsending downlink scheduling information is provided, and includes:

a downlink scheduling receiving module, configured to receive, on afifth downlink subframe that is on a first carrier and that is at timebefore time of a first downlink subframe, downlink schedulinginformation which is sent by a base station and is corresponding to thefirst downlink subframe on a second carrier, in which at timecorresponding to the first downlink subframe on the second carrier, asubframe on the first carrier is an uplink subframe; and

a downlink data receiving module, configured to receive, on the firstdownlink subframe on the second carrier, downlink data corresponding tothe downlink scheduling information according to the received downlinkscheduling information.

According to still another aspect of the present invention, a method forreceiving downlink scheduling information is provided, and includes:

on a downlink subframe that is on a first carrier and that is at timebefore time of a first downlink subframe, receiving downlink schedulinginformation, sent by a base station in a cross-subframe manner,corresponding to the first downlink subframe on a second carrier, anddownlink scheduling information, sent by the base station in a subframewith the same time manner, corresponding to a second downlink subframeon the second carrier, in which a subframe with the same time on thefirst carrier and of the first downlink subframe on the second carrieris an uplink subframe; and a subframe with the same time of the firstcarrier and of the second downlink subframe on the second carrier is adownlink subframe;

at the time of determining that a cross-carrier downlink scheduling typeof a downlink subframe on the first carrier is subframe with the sametime downlink scheduling, receiving, in a subframe with the same timemanner on the second carrier, downlink data scheduled by downlinkscheduling information; and

at the time of determining that a cross-carrier downlink scheduling typeof a downlink subframe on the first carrier is cross-subframe downlinkscheduling, receiving, in a cross-subframe manner on the second carrier,downlink data scheduled by downlink scheduling information.

According to still another aspect of the present invention, an apparatusfor receiving downlink scheduling information is provided, where theapparatus includes:

a downlink scheduling receiving module, configured to, on a downlinksubframe that is on a first carrier and that is at time before time of afirst downlink subframe, receive downlink scheduling information, sentby a base station in a cross-subframe manner, corresponding to the firstdownlink subframe on a second carrier, and downlink schedulinginformation, sent by the base station in a subframe with the same timemanner, corresponding to a second downlink subframe on the secondcarrier, in which a subframe with the same time on the first carrier andof the first downlink subframe on the second carrier is an uplinksubframe; and a subframe with the same time of the first carrier and ofthe second downlink subframe on the second carrier is a downlinksubframe;

a first downlink data receiving module, configured to, at the time ofdetermining that a cross-carrier downlink scheduling type of a downlinksubframe on the first carrier is subframe with the same time downlinkscheduling, receive, in a subframe with the same time manner on thesecond carrier, downlink data scheduled by downlink schedulinginformation; and

a second downlink data receiving module, configured to, at the time ofdetermining that a cross-carrier downlink scheduling type of a downlinksubframe on the first carrier is cross-subframe downlink scheduling,receive, in a cross-subframe manner on the second carrier, downlink datascheduled by downlink scheduling information.

According to still another aspect of the present invention, a method andan apparatus for sending downlink scheduling information, and a methodand an apparatus for receiving downlink scheduling information areprovided. when a first carrier bears a PDCCH on a second carrier, inorder that a PDSCH on the second carrier can be scheduled in across-carrier manner on the first carrier, a base station sends, on afifth downlink subframe on the first carrier, downlink schedulinginformation corresponding to a first downlink subframe, on the secondcarrier, whose subframe with the same time on the first carrier is anuplink subframe. Therefore, at the time of cross-carrier PDCCHscheduling, the base station can send, on the first carrier, downlinkscheduling information for scheduling the PDSCH on the second carrier.

According to still another aspect of the present invention, a method forsending uplink scheduling information is provided, and includes:

determining, in uplink subframes on a second carrier, a first uplinksubframe, in which at time corresponding to a third downlink subframefor scheduling the first uplink subframe on the second carrier duringnon-cross-carrier scheduling, a subframe on a first carrier is an uplinksubframe; and

sending, on a sixth downlink subframe on the first carrier, uplinkscheduling information corresponding to the first uplink subframe on thesecond carrier to a terminal, in which time corresponding to the sixthdownlink subframe is before time corresponding to the first uplinksubframe.

According to still another aspect of the present invention, an apparatusfor sending uplink scheduling information is provided, and includes:

an uplink subframe determining module, configured to determine, inuplink subframes on a second carrier, a first uplink subframe, in whichat time corresponding to a third downlink subframe for scheduling thefirst uplink subframe on the second carrier during non-cross-carrierscheduling, a subframe on the first carrier is an uplink subframe; and

an uplink scheduling sending module, configured to send, on a sixthdownlink subframe on the first carrier, uplink scheduling informationcorresponding to the first uplink subframe on the second carrier to aterminal, in which time corresponding to the sixth downlink subframe isbefore time corresponding to the first uplink subframe.

According to still another aspect of the present invention, a method forreceiving uplink scheduling information is provided, and includes:

on a sixth downlink subframe that is on a first carrier and that is attime before time of a first uplink subframe, receiving uplink schedulinginformation which is sent by a base station and is corresponding to thefirst uplink subframe on a second carrier, in which at timecorresponding to a third downlink subframe for scheduling the firstuplink subframe on the second carrier during non-cross-carrierscheduling, a subframe on the first carrier is an uplink subframe; and

sending, on the first uplink subframe on the second carrier, uplink datacorresponding to the uplink scheduling information according to thereceived uplink scheduling information.

According to still another aspect of the present invention, an apparatusfor receiving uplink scheduling information is provided, and includes:

an uplink scheduling receiving module, configured to receive, on a sixthdownlink subframe that is on a first carrier and that is at time beforetime of a first uplink subframe, uplink scheduling information which issent by a base station and is corresponding to the first uplink subframeon a second carrier, in which at time corresponding to a third downlinksubframe for scheduling the first uplink subframe on the second carrierduring non-cross-carrier scheduling, a subframe on the first carrier isan uplink subframe; and

an uplink data sending module, configured to send, on the first uplinksubframe on the second carrier, uplink data corresponding to the uplinkscheduling information according to the received uplink schedulinginformation.

According to still another aspect of the present invention, a method andan apparatus for sending uplink scheduling information, and a method andan apparatus for receiving uplink scheduling information are provided.when a physical downlink control channel on a second carrier is borne ona first carrier, a base station adjusts, in a cross-subframe manner,uplink scheduling information corresponding to a third downlink subframeon the second carrier onto a sixth downlink subframe before a firstuplink subframe on the first carrier and sends the uplink schedulinginformation. Therefore, at the time of cross-carrier PDCCH scheduling,the PUSCH on the second carrier can be scheduled on the first carrier.

According to still another aspect of the present invention, a method forsending downlink scheduling information is provided, and includes:

determining, in downlink subframes on a second carrier, a downlinksubframe A; and

sending, on a downlink subframe B on a first carrier, downlinkscheduling information for scheduling the downlink subframe A on thesecond carrier to a terminal, in which

if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is an uplink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A; or

if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is a downlink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A, or, time corresponding to thedownlink subframe B is the same time as the time corresponding to thedownlink subframe A.

According to still another aspect of the present invention, an apparatusfor sending downlink scheduling information is provided, and includes:

a downlink subframe determining module, for determining, in downlinksubframes on a second carrier, a downlink subframe A; and

a downlink scheduling sending module, for sending, on a downlinksubframe B on a first carrier, downlink scheduling information of thedownlink subframe A on the second carrier to a terminal, in which if asubframe on the first carrier at time the same as that of the downlinksubframe A on the second carrier is an uplink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A; or if a subframe on the firstcarrier at time the same as that of the downlink subframe A on thesecond carrier is a downlink subframe, time corresponding to thedownlink subframe B is before the time corresponding to the downlinksubframe A, or, time corresponding to the downlink subframe B is thesame time as the time corresponding to the downlink subframe A.

According to still another aspect of the present invention, a method forreceiving downlink scheduling information is provided, and includes:

receiving, by a terminal, on a downlink subframe B on a first carrier,downlink scheduling information, of a downlink subframe A on a secondcarrier, sent by a base station, in which

if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is an uplink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A; or

if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is a downlink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A, or, time corresponding to thedownlink subframe B is the same time as the time corresponding to thedownlink subframe A; and

receiving, by the terminal on the downlink subframe A on the secondcarrier, downlink data corresponding to the downlink schedulinginformation according to the received downlink scheduling information.

According to still another aspect of the present invention, an apparatusfor receiving downlink scheduling information is provided, and includes:

a downlink scheduling receiving module, configured to receive, on adownlink subframe B on a first carrier, downlink scheduling information,of a downlink subframe A on a second carrier, sent by a base station, inwhich if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is an uplink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A; or if a subframe on the firstcarrier at time the same as that of the downlink subframe A on thesecond carrier is a downlink subframe, time corresponding to thedownlink subframe B is before the time corresponding to the downlinksubframe A, or, time corresponding to the downlink subframe B is thesame time as the time corresponding to the downlink subframe A; and

a downlink data receiving module, configured to receive, on the downlinksubframe A on the second carrier, downlink data corresponding to thedownlink scheduling information according to the received downlinkscheduling information.

In the method and the apparatus for sending downlink schedulinginformation, and the method and the apparatus for receiving downlinkscheduling information of the embodiments of the present invention, whena first carrier bears a PDCCH on a second carrier, if at timecorresponding to a downlink subframe A on the second carrier, a subframeon the first carrier is an uplink subframe, a base station sends, on adownlink subframe B on the first carrier whose time is before the timecorresponding to the downlink subframe A, downlink schedulinginformation corresponding to the downlink subframe A on the secondcarrier to a terminal, so when the first carrier schedules the secondcarrier in a cross-carrier manner, the base station can send, on thefirst carrier, downlink scheduling information for scheduling the PDSCHon the second carrier to the terminal. If at time corresponding to thedownlink subframe A on the second carrier, a subframe on the firstcarrier is a downlink subframe, the base station can send, on thedownlink subframe B on the first carrier whose time is before the timecorresponding to the downlink subframe A, downlink schedulinginformation corresponding to the downlink subframe A on the secondcarrier to the terminal, or can also send, on the downlink subframe A ofthe first carrier, the downlink scheduling information corresponding tothe downlink subframe A on the second carrier to the terminal.

According to still another aspect of the present invention, a method forsending uplink scheduling information is provided, and includes:

determining, in uplink subframes on a second carrier, an uplink subframeC; and

sending, on a downlink subframe D on the first carrier, uplinkscheduling information for scheduling the uplink subframe C on thesecond carrier to a terminal, in which

an interval between time corresponding to a subframe E on the firstcarrier and time corresponding to the uplink subframe C is a schedulinginterval: N subframes, and if the subframe E is a downlink subframe, thedownlink subframe D and the subframe E are the subframe with the sametime, or time corresponding to the downlink subframe D is before thetime corresponding to the subframe E; or

if the subframe E is an uplink subframe, time corresponding to thedownlink subframe D is before the time corresponding to the subframe E;and

the scheduling interval N is the number of subframes at least which arespaced by between time when the terminal receives the uplink schedulinginformation and time when the terminal sends uplink data correspondingto the uplink scheduling information.

According to still another aspect of the present invention, an apparatusfor sending uplink scheduling information is provided, and includes:

an uplink subframe determining module, configured to determine, inuplink subframes on a second carrier, an uplink subframe C; and

an uplink scheduling sending module, configured to send, on a downlinksubframe D on the first carrier, uplink scheduling information of theuplink subframe C on the second carrier to a terminal, in which aninterval between time corresponding to a subframe E on the first carrierand time corresponding to the uplink subframe C is a schedulinginterval: N subframes, and if the subframe E is a downlink subframe, thedownlink subframe D and the subframe E are the subframe with the sametime, or the downlink subframe D is before the subframe E; or if thesubframe E is an uplink subframe, the downlink subframe D is before thesubframe E; and the N is the number of subframes at least which arespaced by between receiving, by the terminal, the uplink schedulinginformation and sending, by the terminal, uplink data corresponding tothe uplink scheduling information.

According to still another aspect of the present invention, a method forreceiving uplink scheduling information is provided, and includes:

receiving, by a terminal, on a downlink subframe D on a first carrier,uplink scheduling information, of an uplink subframe C on a secondcarrier, sent by a base station, in which

an interval between time corresponding to a subframe E on the firstcarrier and time corresponding to the uplink subframe C is a schedulinginterval: N subframes, and if the subframe E is a downlink subframe, thedownlink subframe D and the subframe E are subframe with the same time,or the downlink subframe D is before the subframe E; or

if the subframe E is an uplink subframe, the downlink subframe D isbefore the subframe E; and the N is the number of subframes at leastwhich are spaced by between receiving, by the terminal, the uplinkscheduling information and sending, by the terminal, uplink datacorresponding to the uplink scheduling information; and

sending, by the terminal, on the uplink subframe C on the secondcarrier, uplink data corresponding to the uplink scheduling informationto the base station according to the received uplink schedulinginformation.

According to still another aspect of the present invention, an apparatusfor receiving uplink scheduling information is provided, and includes:

an uplink scheduling receiving module, configured to receive, on adownlink subframe D on a first carrier, uplink scheduling information,of an uplink subframe C on a second carrier, sent by a base station, inwhich an interval between time corresponding to a subframe E on thefirst carrier and time corresponding to the uplink subframe C is ascheduling interval: N subframes, and if the subframe E is a downlinksubframe, the downlink subframe D and the subframe E are subframe withthe same time, or the downlink subframe D is before the subframe E; orif the subframe E is an uplink subframe, the downlink subframe D isbefore the subframe E; and the N is the number of subframes at leastwhich are spaced by between receiving, by the terminal, the uplinkscheduling information and sending, by the terminal, uplink datacorresponding to the uplink scheduling information; and

an uplink data sending module, configured to send, on the uplinksubframe C on the second carrier, uplink data corresponding to theuplink scheduling information to the base station according to thereceived uplink scheduling information.

In the method and the apparatus for sending uplink schedulinginformation, and the method and the apparatus for receiving uplinkscheduling information of the embodiments of the present invention, whena PDCCH on a second carrier is borne on a first carrier, and when a basestation sends, on a downlink subframe D on the first carrier, uplinkscheduling information corresponding to an uplink subframe C on thesecond carrier to a terminal, the downlink subframe D can be thedownlink subframe E satisfying the minimum scheduling interval: Nsubframes between the downlink subframe E and the uplink subframe C, orcan also be before the downlink subframe E; if a subframe satisfying theminimum scheduling interval: N subframes between the subframe and theuplink subframe C is an uplink subframe, the downlink subframe D isbefore the subframe satisfying the minimum scheduling interval: Nsubframes between the subframe and the uplink subframe C. Therefore, thebase station can send, on the first carrier, uplink schedulinginformation for scheduling the PUSCH on the second carrier to theterminal, so as to solve the technical problem that when at timecorresponding to the downlink subframe, on the second carrier, forscheduling the uplink subframe C during non-cross-carrier scheduling, asubframe on the first carrier is an uplink subframe, the base stationschedules, on the first carrier, the uplink subframe C on the secondcarrier.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention or in the prior art more clearly, the following brieflyintroduces the accompanying drawings required for describing theembodiments or the prior art. Apparently, the accompanying drawings inthe following description show some embodiments of the presentinvention, and persons of ordinary skill in the art may still deriveother drawings from these accompanying drawings without creativeefforts.

FIG. 1A is a flow chart of Embodiment 1 of a method for sending downlinkscheduling information provided by the present invention;

FIG. 1B is an application scenario diagram of Embodiment 1 of the methodfor sending downlink scheduling information provided by the presentinvention;

FIG. 2A is a flow chart of Embodiment 2 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 2B is an application scenario diagram of Embodiment 2 of the methodfor sending downlink scheduling information provided by the presentinvention;

FIG. 3A is a flow chart of Embodiment 3 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 3B is an application scenario diagram of Embodiment 3 of the methodfor sending downlink scheduling information provided by the presentinvention;

FIG. 4A is a flow chart of Embodiment 4 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 4B is an application scenario diagram of Embodiment 4 of the methodfor sending downlink scheduling information provided by the presentinvention;

FIG. 4C is a flow chart of Embodiment 5 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 4D is an application scenario diagram of Embodiment 5 of the methodfor sending downlink scheduling information provided by the presentinvention;

FIG. 5A is a flow chart of Embodiment 1 of a method for sending uplinkscheduling information provided by the present invention;

FIG. 5B is an application scenario diagram of Embodiment 1 of the methodfor sending uplink scheduling information provided by the presentinvention;

FIG. 6A is a flow chart of Embodiment 2 of the method for sending uplinkscheduling information provided by the present invention;

FIG. 6B is an application scenario diagram of Embodiment 2 of the methodfor sending uplink scheduling information provided by the presentinvention;

FIG. 7A is a flow chart of Embodiment 3 of the method for sending uplinkscheduling information provided by the present invention;

FIG. 7B is an application scenario diagram of Embodiment 3 of the methodfor sending uplink scheduling information provided by the presentinvention;

FIG. 8 is a flow chart of Embodiment 4 of the method for sending uplinkscheduling information provided by the present invention;

FIG. 9 is a schematic structural diagram of Embodiment 1 of an apparatusfor sending downlink scheduling information provided by the presentinvention;

FIG. 10 is a schematic structural diagram of Embodiment 1 of anapparatus for sending uplink scheduling information provided by thepresent invention;

FIG. 11 is a flow chart of Embodiment 1 of a method for receivingdownlink scheduling information provided by the present invention;

FIG. 12A is a schematic structural diagram of Embodiment 1 of anapparatus for receiving downlink scheduling information provided by thepresent invention;

FIG. 12B is a schematic structural diagram of Embodiment 2 of theapparatus for receiving downlink scheduling information provided by thepresent invention;

FIG. 13 is a flow chart of Embodiment 1 of a method for receiving uplinkscheduling information provided by the present invention;

FIG. 14A is a schematic structural diagram of Embodiment 1 of anapparatus for receiving uplink scheduling information provided by thepresent invention;

FIG. 14B is a schematic structural diagram of Embodiment 2 of theapparatus for receiving uplink scheduling information provided by thepresent invention;

FIG. 15 is an application scenario diagram of solving PDCCH interferencebetween a macro cell and a micro cell through a method for switching offsending of a PDCCH with an interfering cell provided by the presentinvention;

FIG. 16A is a flow chart of Embodiment 6 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 16B is an application scenario diagram of Embodiment 6 of themethod for sending downlink scheduling information provided by thepresent invention;

FIG. 16C is an application scenario diagram of Embodiment 6 of themethod for sending downlink scheduling information provided by thepresent invention;

FIG. 16D is an application scenario diagram of Embodiment 6 of themethod for sending downlink scheduling information provided by thepresent invention;

FIG. 17A is a flow chart of Embodiment 7 of the method for sendingdownlink scheduling information provided by the present invention;

FIG. 17B is an application scenario diagram of Embodiment 7 of themethod for sending downlink scheduling information provided by thepresent invention;

FIG. 17C is another application scenario diagram of a flow chart ofEmbodiment 7 of the method for sending downlink scheduling informationprovided by the present invention;

FIG. 18 is a flow chart of Embodiment 2 of the method for receivingdownlink scheduling information provided by the present invention;

FIG. 19A is a flow chart of Embodiment 5 of the method for sendinguplink scheduling information provided by the present invention;

FIG. 19B is an application scenario diagram of a flow chart ofEmbodiment 5 of the method for sending uplink scheduling informationprovided by the present invention;

FIG. 20 is a flow chart of Embodiment 2 of the method for receivinguplink scheduling information provided by the present invention;

FIG. 21 is a schematic structural diagram of Embodiment 2 of theapparatus for sending downlink scheduling information provided by thepresent invention;

FIG. 22 is a schematic structural diagram of Embodiment 3 of theapparatus for receiving downlink scheduling information provided by thepresent invention;

FIG. 23 is a schematic structural diagram of Embodiment 2 of theapparatus for sending uplink scheduling information provided by thepresent invention; and

FIG. 24 is a schematic structural diagram of Embodiment 3 of theapparatus for receiving uplink scheduling information provided by thepresent invention.

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of theembodiments of the present invention more comprehensible, the followingclearly and completely describes the technical solutions in theembodiments of the present invention with reference to the accompanyingdrawings in the embodiments of the present invention. Apparently, thedescribed embodiments are merely a part rather than all of theembodiments of the present invention. All other embodiments obtained bypersons of ordinary skill in the art based on the embodiment of thepresent invention without creative efforts shall fall within theprotection scope of the present invention.

FIG. 1A is a flow chart of Embodiment 1 of a method for sending downlinkscheduling information provided by the present invention. As shown inFIG. 1A, this embodiment includes the following steps.

Step 11: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Cross-carrier PDCCH scheduling is to send a PDCCH corresponding to acarrier on another carrier. Information borne in the PDCCH can be aDL_grant or UL_grant, which carries scheduling information indicatingtime frequency resource assignment of a PDSCH or a PUSCH respectively. Adownlink subframe on a carrier is used to bear downlink schedulinginformation and uplink scheduling information on the carrier. Duringmulti-carrier aggregation, in the embodiment of the present invention, acarrier bearing a PDCCH corresponding to another carrier is referred toas a first carrier, and the another carrier is referred to as a secondcarrier. Two subframes on the first carrier and the second carrier atthe same time are referred to as the subframe with the same, and twosubframes at different time are referred to as cross subframes.

When a PDCCH is borne on the second carrier, a downlink subframe on thesecond carrier is used to bear downlink scheduling information and aPDSCH on the carrier. When the PDCCH on the second carrier is borne onthe first carrier (cross-carrier scheduling) during multi-carrieraggregation, if a subframe with the same time on the first carrier andcorresponding to a downlink subframe on the second carrier is an uplinksubframe, downlink scheduling information corresponding to the downlinksubframe on the second carrier (that is, downlink scheduling informationused to schedule a PDSCH borne by the downlink subframe on the secondcarrier) cannot be sent on a subframe with the same time correspondingto the first carrier, so downlink scheduling on the second carriercannot be implemented on the first carrier. In order to enable thedownlink scheduling information corresponding to the downlink subframeon the second carrier to be sent on the first carrier, the base stationneeds to determine whether a subframe with the same time on the firstcarrier and corresponding to each downlink subframe on the secondcarrier is an uplink subframe. In the embodiment of the presentinvention, a subframe with the same time on the first carrier and of thefirst downlink subframe on the second carrier is an uplink subframe; asubframe with the same time of the first carrier and of the seconddownlink subframe on the second carrier is a downlink subframe.

A scenario that the downlink scheduling information on the secondcarrier cannot be sent on a subframe with the same time corresponding tothe first carrier is illustrated in combination with a timingrelationship between a PDCCH &PDSCH and an uplink ACK/NACK of the firstcarrier, and a timing relationship between a PDCCH &PDSCH and an uplinkACK/NACK of the second carrier in an LTE TDD system below. In the timingrelationship between a PDCCH &PDSCH and an uplink ACK/NACK shown in FIG.1B, the DL_grant and the PDSCH scheduled by the DL_grant are located onsubframes with the same time, the PDSCH and the uplink ACK/NACKcorresponding to the PDSCH are not located on subframes with the sametime, subframes where digits are located are uplink subframes, and allother subframes are downlink subframes. A digit in an uplink subframedenotes a downlink subframe, an uplink ACK/NACK corresponding to a PDSCHof which needs to be fed back on the current uplink subframe. Taking thefirst carrier as an example, the digit in the uplink subframe 2 denotesthat an uplink ACK/NACK corresponding to a PDSCH on a downlink subframe6 of a previous radio frame needs to be fed back on the uplink subframe2, and the downlink subframe 6 bears a PDSCH corresponding to anACK/NACK on the uplink subframe 2 of a next radio frame and schedulesthe DL_grant of the PDSCH. The uplink ACK/NACK is ACK/NACK informationfed back by the corresponding downlink subframe which performsscheduling.

As shown in FIG. 1B, subframes on the first carrier at the same time asthat of downlink subframes 3, 4, 8 and 9 on the second carrier areuplink subframes, namely, uplink and downlink configurations of thefirst carrier and the second carrier are different. Therefore, duringcross-carrier scheduling, the downlink scheduling informationcorresponding to the downlink subframes 3, 4, 8 and 9 of the secondcarrier cannot be sent on the first carrier. All corresponding subframeswith the same time on the first carrier and of the downlink subframes 3,4, 8 and 9 of the second carrier are uplink subframes, which arereferred to as first downlink subframes of the second carrier in theembodiment of the present invention. All corresponding subframes withthe same time on the first carrier and of the downlink subframes 0, 1, 5and 6 of the second carrier are downlink subframes, which are referredto as second downlink subframes of the second carrier in the embodimentof the present invention.

Step 12: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in whichtime corresponding to the fifth downlink subframe is before the timecorresponding to the first downlink subframe.

A subframe with the same time on the first carrier and corresponding toa second downlink subframe on the second carrier is also a downlinksubframe, so the downlink scheduling information corresponding to thesecond downlink subframe on the second carrier can be directly sent on acorresponding subframe with the same time on the first carrier. Thedownlink scheduling information corresponding to the first downlinksubframe on the second carrier needs to be adjusted onto a downlinksubframe on the first carrier and be borne. Therefore, when the basestation determines that a first downlink subframe exists on the secondcarrier, downlink subframes, on the first carrier, whose time is beforethat of the first downlink subframe are determined, and the downlinkscheduling information corresponding to the first downlink subframe onthe second carrier is adjusted onto any one downlink subframe on thedownlink subframes, on the first carrier, whose time is before that ofthe first downlink subframe and is borne. In the embodiment of thepresent invention, a downlink subframe, on the first carrier, used tobear the downlink scheduling information corresponding to the firstdownlink subframe on the second carrier is referred to as the fifthdownlink subframe on the first carrier. The downlink schedulinginformation corresponding to the first downlink subframe on the secondcarrier is adjusted onto the fifth downlink subframe on the firstcarrier and is borne; the base station can notify the terminal of thetime sequence relationship between subframes after the adjustmentthrough signaling, and can also configure the timing relationshipbetween subframes for the terminal, so that the terminal receives thedownlink scheduling information according to the timing relationshipbetween subframes, and replies with a corresponding ACK/NACK.Furthermore, the base station can also add a subframe indicator fieldinto the downlink scheduling information of the first carrier, thesubframe indicator field is used to indicate the downlink subframe onthe second carrier scheduled by the downlink scheduling information in across-carrier manner, namely, indicate a downlink subframe, on thesecond carrier, on which the downlink data scheduled by the downlinkscheduling information in a cross-carrier manner is located. For aspecific indication method, reference is made to description in anembodiment corresponding to FIG. 17A.

As shown in FIG. 1B, DL-grant corresponding to the downlink subframes 3and 4 of the second carrier can be adjusted to the downlink subframe 0or 1 on the first carrier in a cross-subframe manner and be borne;DL-Grants corresponding to the downlink subframes 8 and 9 of the secondcarrier can be adjusted to the downlink subframe 5 or 6 on the firstcarrier in a cross-subframe manner.

Furthermore, the base station further sends downlink schedulinginformation corresponding to the second downlink subframe on the secondcarrier in a subframe with the same time manner, and sends the downlinkscheduling information corresponding to the downlink subframe on thefirst carrier uplink in a subframe with the same time manner to theterminal on the fifth downlink subframe on the first carrier.

As far as a terminal is concerned, at most two PDCCHs are sent on eachdownlink subframe on the first carrier, and after the downlinkscheduling information borne by the first downlink subframe on thesecond carrier is adjusted to the downlink subframe on the firstcarrier, one downlink subframe may send more than three PDCCHs. Whenmore than three PDCCHs are sent on one downlink subframe on the firstcarrier, these PDCCHs are divided into three types, in which a type isused to schedule a PDSCH of the downlink subframe on the first carrier;another type is used to schedule a PDSCH corresponding to a subframewith the same time on the second carrier; still another type is used toschedule a PDSCH corresponding to a cross subframe on the secondcarrier. Under the situation without considering PDCCH loads ofsubframes, more than one PDSCH on the second carrier may be adjusted tothe downlink subframe on the first carrier in a cross-subframe manner tobe scheduled.

When the base station sends, on a downlink subframe that is on the firstcarrier and that is at time before time of the first downlink subframe,a PDCCH to the terminal, an independent scheduling manner can beadopted, or a joint scheduling manner can also be adopted. Duringindependent scheduling, the downlink scheduling information forscheduling corresponding PDSCHs is sent to the terminal separatelythrough a plurality of independent PDCCHs. Specifically, on downlinksubframes of the first carrier, the downlink scheduling informationborne by the first downlink subframe on the second carrier is sent in across-subframe manner to the terminal through a PDCCH, the downlinkscheduling information borne by the second downlink subframe on thesecond carrier is sent in a subframe with the same time manner to theterminal through another PDCCH, and then the downlink schedulinginformation on the first carrier is sent to the terminal through anotherPDCCH. If a downlink subframe on the first carrier schedules more thanone PDSCH on the second carrier in a cross-subframe downlink manner,corresponding PDSCHs are scheduled separately in a cross-subframedownlink manner through more than one independent PDCCH.

When the base station jointly schedules a plurality of PDSCHs ondownlink subframes on the first carrier, the downlink schedulinginformation for scheduling the PDSCH on the second carrier in across-carrier manner is borne by adopting a PDCCH, namely, a PDSCHscheduled in a cross-subframe downlink manner and a PDSCH scheduled in asubframe with the same time downlink manner share a PDCCH. At this time,scheduling of two subframes shares control information in the PDCCH. Forthe PDSCH scheduled by the first carrier, the downlink schedulinginformation of the PDSCH is borne by adopting another independent PDCCH.

In the method for sending downlink scheduling information of theembodiment of the present invention, when a first carrier bears a PDCCHon a second carrier, in order that a PDSCH on the second carrier can bescheduled in a cross-carrier manner on the first carrier, a base stationsends, on a fifth downlink subframe on the first carrier, downlinkscheduling information corresponding to a first downlink subframe, onthe second carrier, whose subframe with the same time on the firstcarrier is an uplink subframe. Therefore, at the time of cross-carrierPDCCH scheduling, the base station can send, on the first carrier,downlink scheduling information for scheduling the PDSCH on the secondcarrier.

FIG. 2A is a flow chart of Embodiment 2 of the method for sendingdownlink scheduling information provided by the present invention. Inorder to minimized the latency from sending, by a base station, downlinkscheduling information to receiving, by a terminal, a correspondingPDSCH, as shown in FIG. 2A, this embodiment includes the followingsteps.

Step 21: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Step 22: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in whichthe latency between the time corresponding to the fifth downlinksubframe and the time corresponding to the first downlink subframe isminimum; the time corresponding to the fifth downlink subframe is beforethe time corresponding to the first downlink subframe.

In this embodiment, on the first carrier, the latency between the timecorresponding to the fifth downlink subframe and the time correspondingto the first downlink subframe is minimum, and the time corresponding tothe fifth downlink subframe is before the time corresponding to thefirst downlink subframe. The base station sends, on the fifth downlinksubframe on the first carrier, downlink scheduling informationcorresponding to the first downlink subframe on the second carrier tothe terminal in a cross-subframe manner, in which the latency from thesending time corresponding to the fifth downlink subframe to thatcorresponding to the first downlink subframe on the second carrier isminimum. Moreover, the base station further sends the downlinkscheduling information corresponding to the second downlink subframe onthe second carrier and the downlink scheduling information correspondingto a downlink subframe on the first carrier to the terminal.

In consideration of minimizing the scheduling latency, as shown in FIG.2B, according to the sending method provided by step 22, the DL-Grantcorresponding to the downlink subframe 3 on the second carrier isadjusted onto the downlink subframe 1 of the first carrier and is sent,namely, the base station sends, on the downlink subframe 1 of the firstcarrier, the DL-Grant so as to schedule the PDSCH borne by the downlinksubframe 3 on the second carrier, and the terminal receives, on thedownlink subframe 3 of the second carrier, the PDSCH scheduled on thedownlink subframe 1 of the first carrier. The latency between thedownlink subframe 1 and the downlink subframe 3 is minimum, so thelatency from sending, by the base station, the DL-Grant to receiving, bythe terminal, the PDSCH scheduled by the DL-Grant is minimum. By thesame token, the DL-Grant corresponding to the downlink subframe 4 on thesecond carrier is adjusted to the downlink subframe 1 of the firstcarrier and is sent. The DL-Grant corresponding to the downlinksubframes 8 and 9 on the second carrier is adjusted to the downlinksubframe 6 of the first carrier and is sent.

In this embodiment, when the downlink scheduling informationcorresponding to the first downlink subframe on the second carrier isadjusted to a downlink subframe on the first carrier at time before thatof the first downlink subframe in a cross-subframe manner and is sent,minimization of the latency from sending, by the base station, the PDCCHto receiving, by the terminal, the PDSCH is considered, and the basestation adjusts, in a cross-subframe manner, the downlink schedulinginformation corresponding to the first downlink subframe on the secondcarrier onto a downlink subframe on the first carrier, in which thelatency from the sending time corresponding to the downlink subframe tothat corresponding to the first downlink subframe on the second carrieris minimum.

FIG. 3A is a flow chart of Embodiment 3 of the method for sendingdownlink scheduling information provided by the present invention. Inconsideration that after the scheduling latency is minimized, the PDCCHload on a downlink subframe on the first carrier may be unbalanced, andin order to make compromise between minimization of the schedulinglatency and balance of the PDCCH load, as shown in FIG. 3A, thisembodiment includes the following steps.

Step 31: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Step 32: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in whichthe time corresponding to the fifth downlink subframe is before the timecorresponding to the first downlink subframe, and the fifth downlinksubframe bears downlink scheduling information corresponding to at mostone first downlink subframe on the second carrier.

Step 32 can specifically be: the base station sends, on a seventhdownlink subframe on the first carrier, downlink scheduling informationcorresponding to the first downlink subframe on the second carrier to aterminal. Moreover, the base station further sends the downlinkscheduling information corresponding to the second downlink subframe onthe second carrier and the downlink scheduling information correspondingto a downlink subframe on the first carrier to the terminal.

In consideration of the method for cross-subframe adjustment by adoptingminimization of the scheduling latency, the following phenomenon mayoccur: one downlink subframe on the first carrier may bear downlinkscheduling information of more than three PDSCHs, and another downlinksubframe only bearing downlink scheduling information of two PDSCHs mayexist on the first carrier, namely, the downlink scheduling informationborne by the first carrier and the downlink scheduling information of aPDSCH scheduled in a subframe with the same time downlink manner on thesecond carrier. Therefore, PDCCH loads of downlink subframes on thefirst carrier are unbalanced.

As shown in FIG. 2B, in step 22, the base station sends, on the firstcarrier, the downlink scheduling information, DL-Grants of four PDSCHsneeds to be borne on the downlink subframe 1 of the first carrier,namely, a DL-Grant on the downlink subframe 1 of the first carrier, aDL-Grant corresponding to a subframe with the same time on the secondcarrier (the downlink subframe 1 of the first carrier), a DL-Grantcorresponding to a cross subframe on the second carrier (the downlinksubframe 3 of the first carrier), and a DL-Grant on the downlinksubframe 4, on the second carrier, which is a cross subframe. Thedownlink subframe 0 of the first carrier only needs to bear DL-Grants oftwo PDSCHs, namely, the DL-Grant on the downlink subframe 0 of the firstcarrier, and the DL-Grant on a subframe with the same time on the secondcarrier and of the downlink subframe 0 of the first carrier. By the sametoken, DL-Grants of four PDSCHs need to be borne on the downlinksubframe 6 of the first carrier, while the downlink subframe 5 of thefirst carrier only needs to bear DL-Grants of two PDSCHs. Therefore,loads on the downlink subframe 1 and the downlink subframe 6 of thefirst carrier are maximum, and loads on the downlink subframe 0 and thedownlink subframe 5 are minimum, so that the PDCCH loads of the downlinksubframes on the first carrier are unbalanced.

As shown in FIG. 3B, according to the sending method provided by step32, the DL-Grant on the downlink subframe 3 of the second carrier isadjusted to the downlink subframe 0 on the first carrier. By the sametoken, the DL-Grant on the downlink subframe 8 of the second carrier isadjusted to the downlink subframe 5 on the first carrier, and theDL-Grant on the downlink subframe 9 of the second carrier is adjusted tothe downlink subframe 6 on the first carrier. As shown in FIG. 3B,through the sending method of step 32, each downlink subframe on thefirst carrier bears at most one piece of downlink scheduling informationin a cross-subframe manner. DL-Grants of three PDSCHs are borne on eachof the downlink subframes 0, 1, 5 and 6 of the first carrier. DL-Grantsof three PDSCHs borne by the downlink subframe 0 on the first carrierare respectively: the DL-grant corresponding to the downlink subframe 0of the first carrier, the DL-grant corresponding to the downlinksubframe 0 of the second carrier, and the DL-grant corresponding to thedownlink subframe 3 of the second carrier. DL-Grants of three PDSCHsborne by the downlink subframe 1 on the first carrier are respectively:the DL-grant corresponding to the downlink subframe 1 of the firstcarrier, the DL-grant corresponding to the downlink subframe 1 of thesecond carrier, and the DL-grant corresponding to the downlink subframe4 of the second carrier. DL-Grants of three PDSCHs borne by the downlinksubframe 5 on the first carrier are respectively: the downlinkscheduling information corresponding to the downlink subframe 5 of thefirst carrier, the downlink scheduling information corresponding to thedownlink subframe 5 on the second carrier, and the downlink schedulinginformation corresponding to the downlink subframe 8 on the secondcarrier. DL-Grants of three PDSCHs borne by the downlink subframe 6 onthe first carrier are respectively: the downlink scheduling informationcorresponding to the downlink subframe 6 of the first carrier, thedownlink scheduling information corresponding to the downlink subframe 6on the second carrier, and the downlink scheduling informationcorresponding to the downlink subframe 9 on the second carrier. Thedownlink subframes 0, 1, 5 and 6 on the first carrier are referred to asseventh downlink subframes in the embodiment of the present invention.

Under the cross-carrier scheduling, a carrier whose PDSCH or PUSCH isscheduled by a PDCCH needs to be distinguished. Further, thecross-carrier scheduling and the same-carrier scheduling can bedistinguished through a carrier indicator field (Carrier IndicatorField, CIF for short) in the PDCCH, while in the prior art, there hasbeen no method to distinguish the subframe with the same time downlinkscheduling and the cross-subframe downlink scheduling under thecross-carrier scheduling. As shown in FIG. 3B, in DL-Grants of threePDSCHs borne by the downlink subframe 0 on the first carrier, theDL-grant corresponding to the downlink subframe 0 of the second carrierborne by the downlink subframe 0 of the first carrier is referred to asthe subframe with the same time downlink scheduling under thecross-carrier scheduling of the downlink subframe 0 of the firstcarrier, and the DL-grant corresponding to the downlink subframe 3 ofthe second carrier borne by the downlink subframe 0 of the first carrieris referred to as the cross-subframe downlink scheduling under thecross-carrier scheduling of the downlink subframe 0 of the firstcarrier. The DL-grant corresponding to the downlink subframe 0 of thesecond carrier borne by the downlink subframe 0 of the first carrier,and the DL-grant corresponding to the downlink subframe 3 of the secondcarrier borne by the downlink subframe 0 of the first carrier need to bedistinguished, so that after receiving the PDCCH, the terminaldetermines, according to the indication of the base station, to receivethe corresponding PDSCH on a subframe with the same time of the secondcarrier or to receive the corresponding PDSCH on a cross subframe on thesecond carrier.

The embodiment of the present invention distinguishes cross-carrierscheduling types of downlink subframes on the first carrier mainlythrough the following methods, namely, distinguishes the subframe withthe same time downlink scheduling and the cross-subframe downlinkscheduling.

The first type: distinguishing is made through a CIF. If only twocarriers are configured, some redundancy statuses exist in 3 bits ofCIF. For example, a PDCCH on a configuration 2 carrier is borne on aconfiguration 0 carrier in a cross-carrier manner, CIF=000 denotes thata configuration 0 same-carrier is scheduled, and CIF=001 and 010 denotesthat a configuration 2 cross-carrier is scheduled, in which 001 denotescross-carrier scheduling of a subframe with the same time 0, and 010denotes cross-carrier scheduling of a cross subframe 3.

The second type: distinguishing is made through transmit power control(Transmit Power Control, TPC for short) of an ACK/NACK resourceindicator (ACK/NACK Resource Indicator, ARI for short).

In an R10 system, when a plurality of carriers is aggregated, in whichthere is a pair of uplink and downlink first carriers, the rest carriersare called second carriers, and the ACK/NACK can only be fed back on theuplink first carrier. If a downlink second carrier is scheduled, uplinkACK/NACK resources can be indicated by scheduling 2 bits of TPC in aPDCCH of the downlink second carrier (S-PDCCH, Secondary-PDCCH). At thistime, the TPC is used as an ACK/NACK resource indicator (ARI).Specifically, 2 bits can indicate that one of four resources is used bya UE, and TPC in a PDCCH of the downlink first carrier (P-PDCCH,Primary-PDCCH) is scheduled and used as actual transmit power control.

One manner is: part of statuses, namely, ACK/NACK resources, in an ARIare adopted to distinguish subframe with the same time downlinkscheduling and cross-subframe downlink scheduling under cross-carrierscheduling, such as, statuses 00 and 01 of the ARI denote the subframewith the same time downlink scheduling, and 00 and 01 denote twoavailable ACK/NACK resources of the subframe with the same time downlinkscheduling; the status 10 of the ARI denotes the cross-subframe downlinkscheduling, and 10 denotes ACK/NACK resources of the cross-subframedownlink scheduling; the status 11 of the ARI denotes the subframe withthe same time downlink scheduling and the cross-subframe downlinkscheduling which are simultaneous, and the status 11 denotes ACK/NACKresources of the subframe with the same time downlink scheduling and thecross-subframe downlink scheduling. Specifically, when the ACK/NACK ofthe subframe with the same time downlink scheduling and the ACK/NACK ofthe cross-subframe downlink scheduling are fed back on the same uplinksubframe, the status 11 can denote an ACK/NACK resource shared by thesubframe with the same time downlink scheduling and the cross-subframedownlink scheduling; when the ACK/NACK of the subframe with the sametime downlink scheduling and the ACK/NACK of the cross-subframe downlinkscheduling are fed back on different uplink subframes, the status 11 candenote respective two ACK/NACK resources of the subframe with the sametime downlink scheduling and the cross-subframe downlink scheduling.

The other manner is: distinguishing is made directly by using a TPCfield, and power can be adjusted based on the previous PDCCH or in othermanners.

The third type: distinguishing is made through a downlink assignmentindication (Downlink Assignment Indication, DL DAI for short) in theDL_grant.

Taking the DL DAI as an example, two transmission modes exist for theuplink ACK/NACK under the R10 TDD CA, in which one transmission mode iscalled the PUCCH format 3, which can be used for transmitting theACK/NACK not greater than 20 bits, and at this time, 2 bits of DAI inthe DL_grant are redundant. For example, if two uplink and downlinkconfiguration 2 carriers are aggregated, eight bits of ACK/NACK need tobe fed back on the subframe 2 (if transmission is made by adopting aplurality of code words, the ACK/NACK of two code words corresponding toa same PDSCH adopts a binding feedback manner). The other transmissionmode is called the PUCCH format 1a/1b+channel selection, which can beused for transmitting the ACK/NACK not greater than 4 bits. When thenumber of original bits of the ACK/NACK or the number of original bitsafter code word binding is not greater than 4, the PUCCH format1a/1b+channel selection is directly adopted, and at this time, 2 bits ofDAI in the DL_grant are also redundant; when the number of original bitsof the ACK/NACK or the number of original bits after code word bindingis greater than 4, the number of bits of the ACK/NACK is enabled to benot greater than 4 by adopting time domain part binding. For example, iftwo uplink and downlink configuration 2 carriers are aggregated, eightbits of ACK/NACK need to be fed back on the subframe 2 (after code wordbinding is adopted). At this time, ACK/NACK of different subframes ofeach carrier can be bound into two bits in a time domain manner, sothere are totally four bits for two carriers. Subsequently, transmissionis made by using the PUCCH format 1a/1b+channel selection, and at thistime, 2 bits of DAI in the DL_grant are used for finding whether theDL_grant of the last subframe in the time on each carrier is notdetected by the UE.

Specifically, the method for distinguishing subframe with the same timedownlink scheduling and cross-subframe downlink scheduling undercross-carrier scheduling through a DL DAI is as follows.

a) Distinguishing is directly made by using 2 bits of DL DAI.

Specifically, the distinguishing method is: “01” denotes that onesubframe thereof is scheduled, “10” denotes that the other subframethereof is scheduled, and “11” denotes that the two subframes aresimultaneously scheduled.

b) Discussion is made according to situations.

It is assumed that the PDCCH of the second carrier is borne on the firstcarrier.

When the ACK/NACK transmission mode is the PUCCH format 3 or channelselection of time domain part binding is not performed on the ACK/NACKof the second carrier, 2 bits of DL DAI of the second carrier can bedirectly used, and the specific method is like that in a).

When the ACK/NACK transmission mode is channel selection, and timedomain part binding needs to be performed on the ACK/NACK of the secondcarrier, but when time domain part binding does not need to be performedon the ACK/NACK of the first carrier, the scheduling of the DAI in thePDCCH of the second carrier (S-DAI, Secondary-DAI) and the scheduling ofthe DAI in the PDCCH of the first carrier (P-DAI, Primary-DAI) can bejointly used. The specifically used method is as follows:

The S-DAI is still used as a normal DAI. When joint scheduling isadopted, the P-DAI is used for indicating PDSCH scheduling situations ofa subframe with the same time and a cross subframe on a cross-carrier,and the specific method is like that in a). If the UE receives no P-DAI,the UE thinks that the PDSCH scheduling of a subframe with the same timeand a cross subframe on a cross-carrier is not received. Whenindependent scheduling is adopted, if the P-DAI and the S-DAI are equal,it is denoted that the S-PDCCH of the S-DAI is used for scheduling aPDSCH of a subframe with the same time of a cross-carrier; if unequal,it is denoted that the S-PDCCH of the S-DAI is used for scheduling aPDSCH of a cross subframe on a cross-carrier, and vice versa. If PDSCHsof a subframe with the same time and a cross subframe on a cross-carrierare simultaneously scheduled, an S-DAI with a smaller value denotes thatthe S-PDCCH of the S-DAI is used for scheduling a PDSCH of a subframewith the same time of a cross-carrier, an S-DAI with a larger valuedenotes that the S-PDCCH of the S-DAI is used for scheduling a PDSCH ofa cross subframe on a cross-carrier, and vice versa. If the UE receivesno P-DAI, and only receives one S-DAI, the UE thinks that the PDSCHscheduling of a subframe with the same time and a cross subframe on across-carrier is not received.

The fourth type: distinguishing is made through newly added two bits ina PDCCH.

Two bits are newly added, in which “01” denotes that one subframethereof is scheduled, “10” denotes that the other subframe thereof isscheduled, and “11” denotes that the two subframes are simultaneouslyscheduled.

The fifth type: distinguishing is made through a newly added scramblingcode in a PDCCH.

If independent scheduling is adopted, only one scrambling code needs tobe newly added, the original scrambling code denotes the subframe withthe same time downlink scheduling, and the newly added scrambling codedenotes the cross-subframe downlink scheduling; vice versa.

If joint scheduling is adopted, two scrambling codes 1 and 2 need to benewly added, the original scrambling code denotes the subframe with thesame time downlink scheduling, the newly added scrambling code 1 denotesthe cross-subframe downlink scheduling, and the newly added scramblingcode 2 denotes that a subframe with the same time and a cross subframeare simultaneously scheduled; other combinations are similarly included.

The sixth type: distinguishing is made through a higher-layer signalingconfiguration.

Whether the subframe with the same time downlink scheduling or thecross-subframe downlink scheduling is adopted through a radio resourcecontrol (Radio Resource Control, RRC for short below) signalingconfiguration or a media access control (Media Access Control, MAC forshort below) signaling configuration. Taking the RRC signalingconfiguration as an example, specifically, in a period of time, the RRCsignaling can be semi-statically configured into the subframe with thesame time downlink scheduling of the cross-carrier, and thecross-subframe downlink scheduling of the cross-carrier is notsupported; or the RRC signaling can be semi-statically configured intothe cross-subframe downlink scheduling, and in the subframe, thecross-subframe downlink scheduling of the cross-carrier is notsupported.

The seventh type: distinguishing is made through a search space of aPDCCH.

Implicit indication is made through the location of the PDCCH in thesearch space. For example, scheduling of the PDCCH in a part of thesearch space thereof denotes the subframe with the same time downlinkscheduling, scheduling in another part denotes the cross-subframedownlink scheduling, or a subframe with the same time and a crosssubframe perform scheduling simultaneously. The terminal performs PDCCHblind detection through a specified search space location, or a searchspace location configured by the base station, the PDCCH received inpart 1 of the search space can denote the subframe with the same timedownlink scheduling of the cross-carrier, the PDCCH received in part 2of the search space can denote the cross-subframe downlink scheduling ofthe cross-carrier, and vice versa.

The eighth type: distinguishing is made through a scheduling time of aPDCCH, or other methods for implicit PDCCH notification.

Configurations at different time can be preset or different time can beconfigured by the base station to the UE. For example, scheduling of aPDCCH at a first subframe or a first radio frame denotes the subframewith the same time downlink scheduling, scheduling of a PDCCH at asecond subframe or a second radio frame denotes the cross-subframedownlink scheduling, or a subframe with the same time and a crosssubframe perform scheduling simultaneously.

In the first to fifth distinguishing methods, downlink indicationinformation used to indicate a cross-carrier scheduling type is addedinto the downlink scheduling information through different manners.While in the sixth to eighth methods, the base station and the UE areboth pre-configured with an information distinguishing method or thebase station configures an information distinguishing method to the UEthrough signaling, so that after receiving the downlink schedulinginformation, the terminal distinguishes whether the currentcross-carrier scheduling is the subframe with the same time downlinkscheduling or the cross-subframe downlink scheduling according to thedistinguishing method.

FIG. 4A is a flow chart of Embodiment 4 of the method for sendingdownlink scheduling information provided by the present invention. Inorder to avoid simultaneous occurrence of subframe with the same timedownlink scheduling and cross-subframe downlink scheduling undercross-carrier scheduling on a downlink subframe on a first carrier, asshown in FIG. 4A, this embodiment includes the following steps.

Step 41A: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Step 42A: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in which asubframe on the second carrier at time corresponding to the fifthdownlink subframe is an uplink subframe; the time corresponding to thefifth downlink subframe is before the time corresponding to the firstdownlink subframe.

In this embodiment, at the time corresponding to the fifth downlinksubframe, a subframe on the second carrier is an uplink subframe, andthe time corresponding to the fifth downlink subframe is before the timecorresponding to the first downlink subframe. Step 42A is specifically:The base station sends, on the fifth downlink subframe on the firstcarrier whose corresponding in time is before the corresponding time ofthe first downlink subframe, downlink scheduling informationcorresponding to the first downlink subframe on the second carrier to aterminal, and sends the downlink scheduling information corresponding tothe second downlink subframe on the second carrier and the downlinkscheduling information corresponding to a downlink subframe on the firstcarrier to the terminal.

As shown in FIG. 4B, a subframe with the same time on the first carrierand of the downlink subframe 7 on the second carrier is an uplinksubframe, and the DL-Grant corresponding to the downlink subframe 7 onthe second carrier can be adjusted to the downlink subframe 5 or 6 onthe first carrier in a cross-subframe manner and be borne. Ifminimization of the scheduling latency is considered, the DL-Grantcorresponding to the downlink subframe 7 on the second carrier can beadjusted onto the downlink subframe 6 on the first carrier in across-subframe manner and be borne. In this way, on the downlinksubframe 6 on the first carrier, the subframe with the same timedownlink scheduling occurs: the DL-Grant corresponding to the downlinksubframe 6 on the second carrier, and meanwhile, the cross-subframedownlink scheduling further exists: the DL-Grant corresponding to thedownlink subframe 7 on the second carrier.

When a subframe with the same time on the second carrier and of adownlink subframe on the first carrier is an uplink subframe, thedownlink subframe on the first carrier does not need to bear theDL-Grant of the subframe with the same time on the second carrier.Therefore, in order to avoid simultaneous occurrence of the subframewith the same time downlink scheduling and the cross-subframe downlinkscheduling on one subframe, a cross subframe corresponding to thedownlink subframe on the second carrier can be adjusted onto anotherdownlink subframe on the first carrier, and a subframe with the sametime of the downlink subframe on the second carrier is an uplinksubframe. As shown in FIG. 4B, In consideration of minimizing thescheduling latency, according to the method provided by step 12A, theDL-Grant corresponding to the downlink subframe 7 on the second carrieris adjusted to the downlink subframe 4 on the first carrier and is sent.The subframe 4 on the second carrier is an uplink subframe, so thedownlink subframe 4 on the first carrier does not need to bear thesubframe with the same time downlink scheduling, but only needs to bearthe cross-subframe downlink scheduling, namely, at this time, thesubframe with the same time downlink scheduling and the cross-subframedownlink scheduling of the cross-carrier do not need to bedistinguished.

FIG. 4C is a flow chart of Embodiment 5 of the method for sendingdownlink scheduling information provided by the present invention. Asshown in FIG. 4C, this embodiment includes the following steps.

Step 41B: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Step 42B: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in whichtime corresponding to the fifth downlink subframe is before the timecorresponding to the first downlink subframe, and on the first carrier,ACK/NACK binding does not need to be performed on a subframe where anuplink ACK/NACK corresponding to a PDSCH on the fifth downlink subframeis located.

As shown in FIG. 4D, the downlink scheduling information correspondingto the subframe 4 on the second carrier cannot be sent on a subframe(uplink subframe) with the same time on the first carrier, and thedownlink scheduling information corresponding to the subframe 4 can beadjusted to the subframe 1 on the first carrier according to thecriterion of a minimum ACK/NACK feedback latency. If the combination ofa P-DAI and an S-DAI in the sending method for distinguishing thesubframe with the same time downlink scheduling and the cross-subframedownlink scheduling of the cross-carrier provided by the embodimentcorresponding to FIG. 3A is adopted, the P-DAI of the subframe 1 on thefirst carrier cannot be used, because on the ACK/NACK feedback subframe2 corresponding to the PDSCH on the subframe 1 of the first carrier,time domain ACK/NACK part binding needs to be performed (at this time,ACK/NACK feedbacks exist on two carriers and the number of ACK/NACKfeedbacks on the first carrier is greater than 2) so as to use the P-DAIcounting. Therefore, the downlink scheduling information correspondingto the subframe 4 of the second carrier can be adjusted to the subframe0 on the first carrier. The ACK/NACK feedback subframe 4 correspondingto the PDSCH of the subframe 0 on the first carrier does not need toperform time domain ACK/NACK part binding, so the P-DAI is available.

Through the timing adjustment method, the P-DAI in the PDCCH schedulingthe first carrier can be used together with the S-DAI for distinguishingthe subframe with the same time downlink scheduling and thecross-subframe downlink scheduling of the cross-carrier.

FIG. 5A is a flow chart of Embodiment 1 of a method for sending uplinkscheduling information provided by the present invention. As shown inFIG. 5A, this embodiment includes the following steps.

Step 51: A base station determines, in uplink subframes on a secondcarrier, a first uplink subframe, in which at time corresponding to athird downlink subframe for scheduling the first uplink subframe on thesecond carrier during non-cross-carrier scheduling, a subframe on afirst carrier is an uplink subframe.

When a PDCCH is borne on the second carrier, according to a timingrelationship between a UL_grant on the second carrier and a PUSCHscheduled by the UL_grant, the uplink scheduling information, on thesecond carrier, for scheduling the PUSCH of the first uplink subframe issent on the third downlink subframe on the second carrier. When a PDCCHis borne on the second carrier, a downlink subframe, on the secondcarrier, for scheduling the PUSCH borne on the second uplink subframe isa fourth downlink subframe on the second carrier.

During multi-carrier aggregation, under the situation that the PDCCH onthe second carrier is adjusted onto the first carrier and is borne,according to a timing relationship between a UL_grant on the firstcarrier and a PUSCH scheduled by the UL_grant, a subframe with the sametime corresponding to a third downlink subframe on the first carrier isan uplink subframe, and the uplink scheduling information correspondingto the first uplink subframe on the second carrier (that is, the uplinkscheduling information used to schedule the PUSCH borne on the firstuplink subframe on the second carrier) cannot be sent on a subframe withthe same time on the first carrier. A subframe with the same time on thefirst carrier and corresponding to the fourth downlink subframe on thesecond carrier is a downlink subframe, and during cross-carrierscheduling, the uplink scheduling information corresponding to thesecond uplink subframe can be directly sent on a subframe with the sametime of the fourth downlink subframe on the first carrier. Duringcross-carrier scheduling, the uplink scheduling information schedulingthe second carrier may be sent on the first carrier, so the base stationneeds to determine whether a subframe with the same time on the firstcarrier and corresponding to a downlink subframe, on the second carrier,for scheduling each uplink subframe is an uplink subframe, namely, afirst uplink subframe is determined in all the uplink subframes, and theuplink scheduling information, on the second carrier, for scheduling thePUSCH of the first uplink subframe is sent on a downlink subframe, onthe first carrier, meeting the requirement.

A scenario that the uplink scheduling information on the second carriercannot be sent on a subframe corresponding to the first carrier isillustrated in combination with a timing relationship between a UL_grantand an a PUSCH scheduled by the UL_grant of the first carrier, and atiming relationship between a UL_grant and an a PUSCH scheduled by theUL_grant of the second carrier in an LTE TDD system below.

As shown in FIG. 5B, in the timing relationship between a UL_grant andan a PUSCH scheduled by the UL_grant, a subframe where a digit islocated denotes an uplink subframe, the rest subframes are downlinksubframes, and the digit in the uplink subframe denotes one or severaldownlink subframes, on which the UL_grant scheduling the PUSCH of thecurrent uplink subframe is sent. For example, the PUSCH of the uplinksubframe 8 of the second carrier is scheduled through the UL_grant onthe downlink subframe 4 of the second carrier, and the PUSCH of theuplink subframe 7 of the second carrier is scheduled through theUL_grant on the downlink subframe 1 of the second carrier. The subframewith the same time on the first carrier and of the downlink subframe 1of the second carrier is a downlink subframe, so the UL_grant schedulingthe uplink subframe 7 of the second carrier can be sent on the downlinksubframe 1 of the first carrier (the downlink subframe 1 of the firstcarrier is referred to as a subframe with the same time of the downlinksubframe 1 on the second carrier). The subframe with the same time onthe first carrier and of the downlink subframe 4 of the second carrieris an uplink subframe, so the UL_grant scheduling the uplink subframe 8of the second carrier cannot be sent on the uplink subframe 4 on thefirst carrier. The uplink subframe 8 of the second carrier is referredto as the first uplink subframe on the second carrier in the embodimentof the present invention, and the downlink subframe 4 scheduling thedownlink subframe 8 on the second carrier is referred to as the thirddownlink subframe on the second carrier in the embodiment of the presentinvention.

Step 52: The base station sends, on a sixth downlink subframe on thefirst carrier, uplink scheduling information corresponding to the firstuplink subframe on the second carrier to a terminal, in which timecorresponding to the sixth downlink subframe is before thatcorresponding to the first uplink subframe.

After determining that a first uplink subframe exists on the secondcarrier, the base station adjusts the uplink scheduling information,corresponding to each third downlink subframe, for scheduling each firstuplink subframe separately onto a downlink subframe that is on the firstcarrier and that is at time before time of the first uplink subframe.Certain time needs to be spaced from sending, by the base station, theuplink scheduling information to sending, by the terminal, acorresponding PUSCH (in the current TDD system, time of at least foursubframes needs to be spaced from sending, by the base station, theuplink scheduling information to sending, by the terminal, acorresponding PUSCH), so a certain number of subframes should further bespaced between the downlink subframe and a first uplink subframe, andthe number of subframes is the number of subframes which need to bespaced from sending, by the base station, the uplink schedulinginformation to sending, by the terminal, a corresponding PUSCH. In thisembodiment, a downlink subframe, on the first carrier, for bearing theuplink scheduling information corresponding to the first uplink subframeis referred to as the sixth downlink subframe on the first carrier.

After the uplink scheduling information sent by the first uplinksubframe on the second carrier is adjusted onto the sixth downlinksubframe on the first carrier and is borne, the base station can notifythe terminal of the time sequence relationship between subframes afterthe adjustment through signaling, and can also configure the timingrelationship between subframes after the adjustment for the terminal, sothat after receiving the uplink scheduling information of thecross-carrier, the terminal replies with uplink data scheduled by theuplink scheduling information on a corresponding uplink subframeaccording to the timing relationship between subframes. Furthermore, thebase station can also add a subframe indicator field into the uplinkscheduling information of the first carrier, the subframe indicatorfield is used to indicate the uplink subframe on the second carrierscheduled by the uplink scheduling information in a cross-carriermanner, namely, indicate an uplink subframe, on the second carrier, onwhich the uplink data scheduled by the uplink scheduling information ina cross-carrier manner is sent to the base station. For a specificindication method, reference is made to description in an embodimentcorresponding to FIG. 19A.

When the base station sends, on the sixth downlink subframe on the firstcarrier, the uplink scheduling information corresponding to the firstuplink/downlink subframe on the second carrier, the base station mayfurther send the uplink scheduling information corresponding to thesecond uplink subframe on the second carrier; the base station mayfurther send the uplink scheduling information corresponding to theuplink subframe on the first carrier (which is also referred to as theuplink scheduling information used to schedule the PUSCH borne by theuplink subframe on the first carrier).

As shown in FIG. 5B, neither a UL_grant and a PUSCH scheduled by theUL_grant, nor a PUSCH and a PHICH corresponding to the PUSCH are locatedon a subframe with the same time since the base station or the terminalneeds a certain processing time, and this time interval is generally notless than four subframes. In consideration of the latency from sending,by the base station, the uplink scheduling information to sending, bythe terminal, a corresponding PUSCH, the UL_grant on the second carrierscheduling the uplink subframe 8 can be adjusted onto the downlinksubframe 0 or the downlink subframe 1, on the first carrier, and beborne, in which the downlink subframe 0 or the downlink subframe 1 isbefore the uplink subframe 8, and at least four subframes are spaced bybetween the downlink subframe 0 or the downlink subframe 1 and theuplink subframe.

Furthermore, on the sixth downlink subframe that is on the first carrierand that is at time before time of the first uplink subframe, the basestation further sends to the terminal the uplink scheduling informationcorresponding to the second uplink subframe on the second carrier, andthe uplink scheduling information corresponding to the uplink subframeon the first carrier.

When the base station schedules PUSCH uplink data of the terminal on adownlink subframe on the first carrier, the independent schedulingmanner can be adopted, or the joint scheduling manner can also beadopted. During independent scheduling, the uplink schedulinginformation for scheduling corresponding PUSCHs is sent to the terminalseparately through a plurality of independent PDCCHs. Specifically, ondownlink subframes of the first carrier, the uplink schedulinginformation corresponding to the first uplink subframe on the secondcarrier, the uplink scheduling information corresponding to the seconduplink subframe on the second carrier, and the uplink schedulinginformation corresponding to an uplink subframe on the first carrier aresent in a cross-subframe manner to the terminal respectively through aplurality of independent PDCCHs.

When the base station jointly schedules a plurality of PUSCHs ondownlink subframes on the first carrier, the uplink schedulinginformation for scheduling the PUSCH on the second carrier in across-carrier manner is borne by adopting a PDCCH, namely, after carrieraggregation, a PUSCH scheduled in a cross-subframe manner and a PUSCHscheduled in a subframe with the same time downlink manner share aPDCCH. Specifically, on downlink subframes of the first carrier, theuplink scheduling information corresponding to the first uplink subframeon the second carrier and the uplink scheduling informationcorresponding to the second uplink subframe on the second carrier aresent in a cross-subframe manner to the terminal through a PDCCH. At thistime, scheduling of two subframes shares control information in thePDCCH. The uplink scheduling information corresponding to an uplinksubframe on the first carrier is sent to the terminal through anotherPDCCH.

In the method for sending uplink scheduling information of theembodiment of the present invention, when a physical downlink controlchannel on a second carrier is borne on a first carrier, a base stationadjusts, in a cross-subframe manner, uplink scheduling informationcorresponding to a third downlink subframe on the second carrier onto asixth downlink subframe before a first uplink subframe on the firstcarrier and sends the uplink scheduling information. Therefore, at thetime of cross-carrier PDCCH scheduling, the PUSCH on the second carriercan be scheduled on the first carrier.

FIG. 6A is a flow chart of Embodiment 2 of the method for sending uplinkscheduling information provided by the present invention. In order tominimize the latency from sending, by the base station, the uplinkscheduling information to sending, by the terminal, a correspondingPUSCH, as shown in FIG. 6A, this embodiment includes the followingsteps.

Step 61: A base station determines, in uplink subframes on a secondcarrier, a first uplink subframe, in which at time corresponding to athird downlink subframe for scheduling the first uplink subframe on thesecond carrier during non-cross-carrier scheduling, a subframe on afirst carrier is an uplink subframe.

Step 62: The base station sends, on the sixth downlink subframe on thefirst carrier, uplink scheduling information corresponding to the firstuplink subframe on the second carrier to the terminal, in which thelatency between the sending time corresponding to the sixth downlinksubframe and that corresponding to the first uplink subframe on thesecond carrier is minimum, and the sixth downlink subframe and the firstuplink subframe are at least spaced by N subframes; the timecorresponding to the sixth downlink subframe is before thatcorresponding to the first uplink subframe.

In this embodiment, the latency between the sending time correspondingto the sixth downlink subframe on the first carrier and the sending timecorresponding to the first uplink subframe on the second carrier isminimum, and the sixth downlink subframe and the first uplink subframeare spaced by at least N subframes. The N is the number of subframeswhich are spaced by between receiving, by a terminal, the uplinkscheduling information and sending, by the terminal, the uplink datacorresponding to the uplink scheduling information. Certain time needsto be spaced from receiving, by the terminal, a UL-Grant to sending, bythe terminal, a PUSCH scheduled by the UL-Grant, namely, severalsubframes are spaced by, so when the base station sends the uplinkscheduling information corresponding to the first uplink subframe to theterminal, the sixth downlink subframe and the first uplink subframe needto be spaced by several subframes.

Step 62 is specifically: the base station sends, on the sixth downlinksubframe, the downlink scheduling information corresponding to the firstuplink subframe on the second carrier to the terminal. Furthermore, thebase station further sends, on the sixth downlink subframe, uplinkscheduling information corresponding to the second uplink subframe onthe second carrier and the uplink scheduling information correspondingto an uplink subframe on the first carrier to the terminal.

As shown in FIG. 6B, in the downlink subframe 0 and the downlinksubframe 1 on the first carrier at time before that of the uplinksubframe 8, it is determined that the UL-Grant corresponding to theuplink subframe 8 is sent on the downlink subframe 1. The latency fromtime corresponding to the downlink subframe 1 to that corresponding tothe uplink subframe 8 is minimum, the downlink subframe 1 is before theuplink subframe 8, and the downlink subframe 1 and the uplink subframe 8are at least spaced by four subframes.

FIG. 7A is a flow chart of Embodiment 3 of the method for sending uplinkscheduling information provided by the present invention. Afterminimization of the scheduling latency is considered, one downlinksubframe on the first carrier may bear uplink scheduling information ofmore than three PUSCHs, and another downlink subframe only bearinguplink scheduling information of one PUSCH may exist on the firstcarrier. Therefore, PDCCH loads of downlink subframes on the firstcarrier are unbalanced. In order to make compromise between minimizationof the scheduling latency and balance of the PDCCH load, as shown inFIG. 7A, this embodiment includes the following steps.

Step 71: A base station determines, in uplink subframes on a secondcarrier, a first uplink subframe, in which at time corresponding to athird downlink subframe for scheduling the first uplink subframe on thesecond carrier during non-cross-carrier scheduling, a subframe on afirst carrier is an uplink subframe.

Step 72: The base station sends, on a sixth downlink subframe on thefirst carrier, uplink scheduling information corresponding to the firstuplink subframe on the second carrier to a terminal, in which timecorresponding to the sixth downlink subframe is before thatcorresponding to the first uplink subframe, and the sixth downlinksubframe bears uplink scheduling information corresponding to at mostone first uplink subframe on the second carrier.

In the sending method in step 62, the uplink scheduling informationborne by the third downlink subframe on the second carrier duringnon-cross-carrier scheduling may not be borne on some downlink subframeson the first carrier, that is to say, some downlink subframes do notbear the uplink scheduling information scheduling two or more than twofirst uplink subframes on the second carrier respectively duringnon-cross-carrier scheduling. However, some downlink subframes bear theuplink scheduling information borne during non-cross-carrier schedulingby two or more than two third downlink subframes on the second carrier.As shown in FIG. 6B, according to the sending method in step 62, threeUL_grants borne by the downlink subframe 1 on the first carrierincludes: a UL_grant for scheduling a PUSCH on the uplink subframe 5 onthe first carrier, a UL_grant for scheduling a PUSCH on the uplinksubframe 7 on the second carrier, and a UL_grant for scheduling a PUSCHon the uplink subframe 8 on the second carrier. However, the downlinksubframe 0 on the first carrier only bears one UL_grant: the UL_grantfor scheduling the uplink subframe 4 on the first carrier. Therefore,the load of the downlink subframe 1 on the first carrier is maximumwhile that of the downlink subframe 0 is minimum, so PDCCH loads ofdownlink subframes on the first carrier are unbalanced.

When minimization of the scheduling latency and balance of the PDCCHload are considered, the base station determines the sixth downlinksubframe on downlink subframes on the first carrier at time before thatof the first uplink subframe. The sixth downlink subframe bears uplinkscheduling information corresponding to at most one first uplinksubframe on the second carrier, and the fifth downlink subframe and thefirst uplink subframe are at least spaced by N subframes. Furthermore,besides satisfying the above condition, the latency between the timecorresponding to the sixth downlink subframe and that corresponding tothe first uplink subframe further needs to be minimum.

As shown in FIG. 7B, the downlink subframe 0 of the first carrier isbefore the uplink subframe 8 of the second carrier, and the downlinksubframe 0 and the uplink subframe 8 are spaced by seven subframes;according to the sending method provided by step 72, the UL_grantcorresponding to the downlink subframe 4 on the second carrier isadjusted to the downlink subframe 0 on the first carrier, so thedownlink subframe 0 on the first carrier bears the uplink schedulinginformation corresponding to at most one first uplink subframe on thesecond carrier, and the compromise between the minimization of thescheduling latency and the balance of the PDCCH load is made.

In the uplink scheduling procedure, scheduling of two subframes undercross-carrier scheduling exists. As shown in FIG. 6B, scheduling, on thedownlink subframe 1 on the first carrier, of a PUSCH on the uplinksubframe 7 on the second carrier (during non-cross-carrier scheduling,the downlink subframe 1 on the second carrier schedules the uplinksubframe 7 on the second carrier) is first subframe uplink schedulingunder the cross-carrier; scheduling, on the downlink subframe 1 on thefirst carrier, of a PUSCH on the uplink subframe 8 on the second carrier(during non-cross-carrier scheduling, the downlink subframe 4 on thesecond carrier schedules the uplink subframe 8 on the second carrier;while during cross-carrier scheduling, a subframe with the same time onthe first carrier and of the downlink subframe 4 on the second carrieris an uplink subframe) is second subframe uplink scheduling under thecross-carrier.

The base station indicates a cross-carrier uplink scheduling type of adownlink subframe on the first carrier to the terminal through a newlyadded bit, a newly added scrambling code, a carrier indicator field,transmit power control, a downlink assignment indication, or an uplinkindex (UL Index) in a physical downlink control channel; or, through RRCsignaling, MAC signaling, a search space of a physical downlink controlchannel or a scheduling time of a physical downlink control channel. Thecross-carrier uplink scheduling type includes the first subframe uplinkscheduling and the second subframe uplink scheduling under thecross-carrier. For the specific indication method, reference is made todescription in the embodiment of the method for sending downlinkscheduling information.

FIG. 8 is a flow chart of Embodiment 4 of the method for sending uplinkscheduling information provided by the present invention. Schedulingbetween carriers can be distinguished through a CIF in a PDCCH, while inthe prior art, there has been no method to distinguish scheduling of twosubframes under the cross-carrier scheduling. As shown in FIG. 8, inorder to avoid simultaneous occurrence of the first subframe uplinkscheduling and the second subframe uplink scheduling the second subframeuplink scheduling on downlink subframes of the first carrier, thisembodiment includes the following steps.

Step 81: A base station determines, in uplink subframes on a secondcarrier, a first uplink subframe, in which at time corresponding to athird downlink subframe for scheduling the first uplink subframe on thesecond carrier during non-cross-carrier scheduling, a subframe on afirst carrier is an uplink subframe.

Step 82: The base station sends, on a sixth downlink subframe on thefirst carrier, to the terminal a UL_grant corresponding to the firstuplink subframe on the second carrier, in which a subframe on the secondcarrier at time corresponding to that of the sixth downlink subframebears no UL_grant during non-cross-carrier scheduling; the timecorresponding to the sixth downlink subframe is before thatcorresponding to the first uplink subframe.

In this embodiment, at the time corresponding to the sixth downlinksubframe, a subframe on the second carrier does not bear the UL_grantduring non-cross-carrier scheduling.

As shown in FIG. 7B, the subframe number of a subframe with the sametime on the second carrier and corresponding to the downlink subframe 0on the first carrier does not occur in all uplink subframes on thesecond carrier; meanwhile, the downlink subframe 0 is before the uplinksubframe 8, and seven subframes exist between the downlink subframe 0and the uplink subframe 8. The downlink subframe 0 on the second carrierbears no UL_grant of any uplink subframe before cross-carrierscheduling; after the UL_grant for scheduling the uplink subframe 8 onthe second carrier is adjusted to the downlink subframe 0 on the firstcarrier, only the first subframe uplink scheduling instead of the secondsubframe uplink scheduling exists for the downlink subframe 0 on thefirst carrier under the cross-carrier, namely, at this time, the firstsubframe uplink scheduling and the second subframe uplink schedulingunder the cross-carrier does not need to be distinguished, so thepurpose of avoiding distinguishing of the first subframe uplinkscheduling and the second subframe uplink scheduling under thecross-carrier can be achieved.

FIG. 9 is a schematic structural diagram of Embodiment 1 of an apparatusfor sending downlink scheduling information provided by the presentinvention. As shown in FIG. 9, this embodiment includes: a downlinksubframe determining module 91 and a downlink scheduling sending module92.

The downlink subframe determining module 91 is configured to determine,in downlink subframes on a second carrier, a first downlink subframe, inwhich at time corresponding to the first downlink subframe, a subframeon a first carrier is an uplink subframe.

The downlink scheduling sending module 92 is configured to send, on afifth downlink subframe on the first carrier, downlink schedulinginformation corresponding to the first downlink subframe on the secondcarrier to a terminal, in which the time corresponding to the fifthdownlink subframe is before the time corresponding to the first downlinksubframe.

When minimization of the scheduling latency is considered, the latencybetween time corresponding to the fifth downlink subframe used to sendthe downlink scheduling information corresponding to the first downlinksubframe on the second carrier, and time corresponding to the firstdownlink subframe is minimum. When the compromise between theminimization of the scheduling latency and the load balance is made, asubframe on the second carrier at time corresponding to the fifthdownlink subframe is an uplink subframe. In order to avoiddistinguishing of the subframe with the same time downlink schedulingand the cross-subframe downlink scheduling under the cross-carrierscheduling, the fifth downlink subframe bears downlink schedulinginformation corresponding to at most one first downlink subframe on thesecond carrier.

Furthermore, when the subframe with the same time downlink schedulingand the cross-subframe downlink scheduling under the cross-carrierscheduling are distinguished, the downlink scheduling sending module 92indicates a cross-carrier downlink scheduling type of the fifth downlinksubframe on the first carrier to the terminal through a newly added bit,a newly added scrambling code, a carrier indicator field, transmit powercontrol, a downlink assignment indication, or an ACK/NACK resourceindicator in a physical downlink control channel; or, indicate across-carrier downlink scheduling type of the fifth downlink subframe onthe first carrier to the terminal through radio resource controlsignaling, media access control signaling, a search space of a physicaldownlink control channel or a scheduling time of a physical downlinkcontrol channel.

Additionally, when the downlink scheduling sending module 92 sends thedownlink scheduling information to the terminal, an independentscheduling manner can be adopted, or a joint scheduling manner can alsobe adopted. During independent scheduling, the downlink schedulingsending module 92 is specifically configured to send the downlinkscheduling information corresponding to the first downlink subframe onthe second carrier, the downlink scheduling information corresponding tothe second downlink subframe on the second carrier, and thecorresponding downlink scheduling information on the first carrier tothe terminal respectively through a plurality of independent physicaldownlink control channels. During joint scheduling, the downlinkscheduling sending module 92 is specifically configured to send, on thefifth downlink subframe that is on the first carrier and that is at timebefore time of the first downlink subframe, the downlink schedulinginformation corresponding to the first downlink subframe on the secondcarrier in a cross-subframe manner, and the downlink schedulinginformation corresponding to the second downlink subframe on the secondcarrier in a subframe with the same time manner to the terminal througha physical downlink control channel; and the corresponding downlinkscheduling information on the first carrier to the terminal throughanother physical downlink control channel.

For working mechanisms of the modules, reference is made to descriptionin the embodiments corresponding to FIG. 1A, FIG. 2A, FIG. 3A and FIG.4A, and no more details are given here.

Further, in order to distinguish cross-carrier scheduling types at thetime of scheduling a DL_Grant in a cross-carrier manner on the firstcarrier, a subframe on the first carrier at the same time as that of thefifth downlink subframe on the first carrier is a subframe which is ofall downlink subframes corresponding to an uplink ACK/NACK which thethird uplink subframe on the second carrier is capable of feeding backwhen the second carrier is used to feed back the uplink ACK/NACK, andwhich is at the earliest scheduling time when the second carrier isscheduled by the first carrier in a cross-carrier manner; the downlinkscheduling sending module indicates, through the downlink assignmentindication in the downlink scheduling information sent on the fifthdownlink subframe on the first carrier, the cross-carrier downlinkscheduling type on the fifth downlink subframe on the first carrier tothe terminal.

In the apparatus for sending downlink scheduling information of theembodiment of the present invention, before a first carrier bears aPDCCH on a second carrier in a cross-carrier manner, in order to ensurethat a PDSCH on the second carrier is scheduled in a cross-carriermanner on the first carrier, a base station adjusts downlink schedulinginformation corresponding to a first downlink subframe to a downlinksubframe on the first carrier and bears the downlink schedulinginformation, in which a subframe with the same time on the first carrierand of the first downlink subframe on the second carrier is an uplinksubframe. Therefore, at the time of cross-carrier, the base station cansend, on the first carrier, downlink scheduling information forscheduling the PDSCH on the second carrier.

FIG. 10 is a schematic structural diagram of Embodiment 1 of anapparatus for sending uplink scheduling information provided by thepresent invention. As shown in FIG. 10, the apparatus includes: anuplink subframe determining module 101 and an uplink scheduling sendingmodule 102.

The uplink subframe determining module 101 is configured to determine,in uplink subframes on a second carrier, a first uplink subframe, inwhich at time corresponding to a third downlink subframe for schedulingthe first uplink subframe on the second carrier during non-cross-carrierscheduling, a subframe on the first carrier is an uplink subframe.

The uplink scheduling sending module 102 is configured to send, on asixth downlink subframe on the first carrier, uplink schedulinginformation corresponding to the first uplink subframe on the secondcarrier to a terminal, in which time corresponding to the sixth downlinksubframe is before the first uplink subframe.

If minimization of the scheduling latency is considered, the latencybetween sending time corresponding to the sixth downlink subframe andsending time corresponding to the first uplink subframe on the secondcarrier is minimum, and the sixth downlink subframe and the first uplinksubframe are spaced by at least N subframes; N is the number ofsubframes which are spaced by between receiving, by a terminal, theuplink scheduling information and sending, by the terminal, the uplinkdata corresponding to the uplink scheduling information. Inconsideration that the balance between the minimization of thescheduling latency and the load balance is made, at the timecorresponding to the sixth downlink subframe, a subframe on the secondcarrier does not bear the uplink scheduling information duringnon-cross-carrier scheduling. In order to avoid distinguishing of thefirst subframe uplink scheduling and the second subframe uplinkscheduling under the cross-carrier scheduling, at the time correspondingto the sixth downlink subframe, a subframe on the second carrier doesnot bear the uplink scheduling information during non-cross-carrierscheduling.

Furthermore, the uplink scheduling sending module 102 indicates across-carrier uplink scheduling type of the sixth downlink subframe onthe first carrier to the terminal through a newly added bit, a newlyadded scrambling code, a carrier indicator field, transmit powercontrol, a downlink assignment indication, or an uplink index in aphysical downlink control channel; or, indicate a cross-carrier uplinkscheduling type of the sixth downlink subframe on the first carrier tothe terminal through radio resource control signaling, media accesscontrol signaling, a search space of a physical downlink control channelor scheduling time of a physical downlink control channel.

Additionally, when the uplink scheduling sending module 102 sends theuplink scheduling information to the terminal, an independent schedulingmanner can be adopted, or a joint scheduling manner can also be adopted.During independent scheduling, the uplink scheduling sending module 102is specifically configured to send, on the sixth downlink subframe thatis on the first carrier and that is at time before time of the firstuplink subframe, the uplink scheduling information corresponding to thefirst uplink subframe on the second carrier, the uplink schedulinginformation corresponding to the second uplink subframe on the secondcarrier, and the uplink scheduling information corresponding to anuplink subframe on the first carrier to the terminal respectivelythrough a plurality of independent physical downlink control channels.When joint scheduling is adopted, the uplink scheduling sending module102 is specifically configured to send, on the sixth downlink subframethat is on the first carrier and that is at time before time of thefirst uplink subframe, the uplink scheduling information correspondingto the first uplink subframe on the second carrier, and the uplinkscheduling information corresponding to the second uplink subframe onthe second carrier to the terminal through a physical downlink controlchannel; and send, on a downlink subframe on the first carrier at timebefore that of the first uplink subframe, the uplink schedulinginformation corresponding to an uplink subframe on the first carrier tothe terminal through another physical downlink control channel.

For working mechanisms of the modules, reference is made to descriptionin the embodiments corresponding to FIG. 5A, FIG. 6A, FIG. 7A and FIG.8, and no more details are given here.

Further, in order to distinguish cross-carrier scheduling types at thetime of scheduling a DL_Grant in a cross-carrier manner on the firstcarrier, the downlink scheduling information sent on the fifth downlinksubframe on the first carrier includes a downlink assignment indication,where the downlink assignment indication is used to indicate across-carrier downlink scheduling type on the fifth downlink subframe onthe first carrier to the terminal. The fifth downlink subframe on thefirst carrier is determined according to a method as follows:determining, according to a first time sequence relationship, alldownlink subframes corresponding to a maximum number of uplink ACK/NACKswhich a third uplink subframe on the second carrier is capable offeeding back, and determining a downlink subframe at the earliestscheduling time of all the downlink subframes, in which the downlinksubframe at the earliest scheduling time is a subframe on the secondcarrier at the same time as that of the fifth downlink subframe on thefirst carrier. The first time sequence relationship can be an uplinkACK/NACK time sequence relationship when the second carrier is solelyconfigured.

In the apparatus for sending uplink scheduling information of theembodiment of the present invention, when a physical downlink controlchannel on a second carrier is borne on a first carrier, the uplinkscheduling sending module adjusts, in a cross-subframe manner, uplinkscheduling information corresponding to a third downlink subframe on thesecond carrier onto a sixth downlink subframe before a first uplinksubframe on the first carrier and sends the uplink schedulinginformation. Therefore, at the time of cross-carrier PDCCH scheduling,the PUSCH on the second carrier can be scheduled on the first carrier.

FIG. 11 is a flow chart of Embodiment 1 of a method for receivingdownlink scheduling information further provided by the presentinvention. As shown in FIG. 11, this embodiment includes the followingsteps.

Step 111: A terminal receives, on a fifth downlink subframe that is on afirst carrier and that is at time before time of a first downlinksubframe, downlink scheduling information, sent by a base station,corresponding to the first downlink subframe on a second carrier, inwhich at time corresponding to the first downlink subframe on the secondcarrier, a subframe on the first carrier is an uplink subframe.

The terminal receives, on a fifth downlink subframe that is on a firstcarrier and that is at time before time of a first downlink subframe,downlink scheduling information which is sent by a base station and iscorresponding to the first downlink subframe on a second carrier; andmeanwhile further receives the downlink scheduling informationcorresponding to the second downlink subframe on the second carrier sentby the base station. At time corresponding to the second downlinksubframe on the second carrier, a subframe on the first carrier is adownlink subframe.

Step 112: The terminal receives, on the first downlink subframe on thesecond carrier, downlink data corresponding to the downlink schedulinginformation according to the received downlink scheduling information.

When a physical downlink control channel on a second carrier is borne ona first carrier, the terminal receives, on the fifth downlink subframethat is on the first carrier and that is at time before time of thefirst downlink subframe, the downlink scheduling information which issent by the base station in a cross-subframe manner and is correspondingto the first downlink subframe on the second carrier according to thetiming relationship between a configured PDCCH &PDSCH and an uplinkACK/NACK. In the embodiment of the present invention, the timingrelationship between a PDCCH &PDSCH and an uplink ACK/NACK is a newtiming relationship between a PDCCH &PDSCH and an uplink ACK/NACKdetermined by the base station again in order to schedule, on the firstcarrier, the downlink scheduling information on the second carrier whenthe physical downlink control channel on the second carrier is borne onthe first carrier. The base station can deliver a new timingrelationship between a PDCCH &PDSCH and an uplink ACK/NACK to theterminal through signaling, and the signaling can be higher-layersignaling such as the RRC or the MAC, layer 1 signaling or layer 2signaling, such as the PDCCH. Alternatively, a new timing relationshipbetween a PDCCH &PDSCH and an uplink ACK/NACK is pre-configured at twosides of the base station and the terminal.

Furthermore, when the base station bears the PDCCH on the second carrieronto the first carrier, if a subframe indicator field is added into thedownlink scheduling information on the first carrier, the subframeindicator field is used to indicate the downlink subframe on the secondcarrier scheduled by the downlink scheduling information in across-carrier manner, namely, indicate a downlink subframe, on thesecond carrier, on which the downlink data scheduled by the downlinkscheduling information in a cross-carrier manner is located, theterminal can determine, according to an indicator of the subframeindicator field corresponding to the downlink scheduling information,which downlink subframe on the second carrier is scheduled by thedownlink scheduling information in a cross-carrier manner, so as toreceive the downlink data corresponding to the downlink schedulinginformation on the corresponding downlink subframe on the secondcarrier. For the method for the terminal to determine, according to anindicator of the subframe indicator field corresponding to the downlinkscheduling information, which downlink subframe on the second carrier isscheduled by the downlink scheduling information in a cross-carriermanner, reference can be made to description in the embodimentcorresponding to FIG. 18.

The subframe with the same time downlink scheduling and thecross-subframe downlink scheduling may simultaneously occur on adownlink subframe on the first carrier under the cross-carrier. In orderto distinguish the subframe with the same time downlink scheduling andthe cross-subframe downlink scheduling, the terminal receives across-carrier downlink scheduling type indicated by a newly added bit, anewly added scrambling code, a carrier indicator field, transmit powercontrol, a downlink assignment indication, or an ACK/NACK resourcesindicator in a physical downlink control channel; or RRC signaling, MACsignaling, a search space of a physical downlink control channel orscheduling time of a physical downlink control channel, and receives, onthe first downlink subframe on the second carrier, the downlink datacorresponding to the downlink scheduling information according to thecross-carrier downlink scheduling type of the fifth downlink subframe onthe first carrier and the downlink scheduling information.

At the time of determining that a cross-carrier downlink scheduling typeof a downlink subframe on the first carrier is subframe with the sametime downlink scheduling, the terminal receives, on the first downlinksubframe on the second carrier, the downlink data scheduled by thedownlink scheduling information. At the time of determining that the DLGrant is the subframe with the same time downlink scheduling afterreceiving the DL Grant on the fifth downlink subframe on the firstcarrier at time before that of the first downlink subframe, the terminalreceives, on a subframe with the same time on the second carriercorresponding to the downlink subframe, the PDSCH scheduled by the DLGrant.

Further, when the cross-carrier downlink scheduling type of a downlinksubframe on the first carrier is cross-subframe downlink scheduling, theterminal receives, in a cross-subframe manner on the second carrier, thedownlink data corresponding to the downlink scheduling informationcorresponding to the second downlink subframe on the second carrier. Atthe time of determining that the DL Grant is the cross-subframe downlinkscheduling after receiving the DL Grant on the fifth downlink subframeon the first carrier at time before that of the first downlink subframe,the terminal receives, on a cross subframe on the second carriercorresponding to the downlink subframe, the PDSCH scheduled by the DLGrant.

It should be noted that: under the situation of the cross-subframedownlink scheduling, a time sequence in which the terminal feeds back anACK/NACK corresponding to the PDSCH to the base station is determinedaccording to the PDSCH rather than according to the corresponding PDCCH.

Further, the terminal receives, on the fifth downlink subframe, thedownlink scheduling information, sent by the base station in across-subframe manner, corresponding to the first downlink subframe onthe second carrier according to a new timing relationship between aPDCCH &PDSCH capable of minimizing the scheduling latency and an uplinkACK/NACK, in which the latency from the sending time corresponding tothe fifth downlink subframe to that corresponding to the first downlinksubframe on the second carrier is minimum and the sending timecorresponding to the fifth downlink subframe is before thatcorresponding to the first downlink subframe.

Further, the terminal receives, on the fifth downlink subframe that ison the first carrier and that is at time before time of the firstdownlink subframe, the downlink scheduling information which is sent bythe base station in a cross-subframe manner and is corresponding to thefirst downlink subframe on the second carrier according to the newtiming relationship between a PDCCH &PDSCH and an uplink ACK/NACK whichcan be compromised between the minimization of the scheduling latencyand the PDCCH load. The fifth downlink subframe only bears downlinkscheduling information corresponding to one first downlink subframe.

Further, in order to avoid distinguishing of the cross-subframe downlinkscheduling and the subframe with the same time downlink scheduling underthe cross-carrier downlink scheduling, the base station can send thedownlink scheduling information to the terminal on the fifth downlinksubframe, in which the time of the fifth downlink subframe on the firstcarrier is before that of the first downlink subframe and subframe withthe same time on the second carrier and of the fifth downlink subframeis an uplink subframe. Therefore, the terminal receives, on the fifthdownlink subframe according to the timing relationship between a PDCCH&PDSCH and an uplink ACK/NACK, the downlink scheduling information sentin a cross-subframe manner by the base station, in which the time of thefifth downlink subframe on the first carrier is before that of the firstdownlink subframe and subframe with the same time on the second carrierand of the fifth downlink subframe is an uplink subframe.

The present invention further provides an embodiment of an apparatus forreceiving downlink scheduling information. FIG. 12A is a schematicstructural diagram of Embodiment 1 of an apparatus for receivingdownlink scheduling information provided by the present invention. Asshown in FIG. 12A, this embodiment includes: a downlink schedulingreceiving module 121 and a downlink data receiving module 122.

The downlink scheduling receiving module 121 is configured to receive,on a fifth downlink subframe that is on a first carrier and that is attime before time of a first downlink subframe, downlink schedulinginformation, sent by a base station, corresponding to the first downlinksubframe on a second carrier, in which at time corresponding to thefirst downlink subframe on the second carrier, a subframe on the firstcarrier is an uplink subframe.

The downlink data receiving module 122 is configured to receive, on thefirst downlink subframe on the second carrier, downlink datacorresponding to the downlink scheduling information according to thereceived downlink scheduling information.

Further, when minimization of the scheduling latency is considered, thelatency between the time corresponding to the fifth downlink subframeand the time corresponding to the first downlink subframe is minimum.

Further, in consideration that the compromise between the minimizationof the scheduling latency and the PDCCH load is made, the fifth downlinksubframe bears downlink scheduling information corresponding to at mostone first downlink subframe on the second carrier.

Further, in order to avoid distinguishing of the subframe with the sametime downlink scheduling and the cross-subframe downlink schedulingunder the cross-carrier scheduling, at the time corresponding to thefifth downlink subframe, a subframe on the second carrier is an uplinksubframe.

In order to distinguishing the subframe with the same time downlinkscheduling and the cross-subframe downlink scheduling information underthe cross-carrier scheduling, as shown in FIG. 12B, on the basis of FIG.12A, a downlink scheduling type receiving module 123 is furtherincluded. FIG. 12B is a schematic structural diagram of Embodiment 2 ofthe apparatus for receiving downlink scheduling information provided bythe present invention.

The downlink scheduling type receiving module 123 is configured toreceive a cross-carrier downlink scheduling type of the fifth downlinksubframe on the first carrier, wherein the cross-carrier downlinkscheduling type is indicated by a newly added bit, a newly addedscrambling code, a carrier indicator field, transmit power control, adownlink assignment indication, or an ACK/NACK resource indicator in aphysical downlink control channel; or indicated by radio resourcecontrol signaling, media access control signaling, a search space of aphysical downlink control channel or scheduling time of a physicaldownlink control channel.

The downlink data receiving module 122 is specifically configured toreceive, on the first downlink subframe on the second carrier, thedownlink data corresponding to the downlink scheduling informationaccording to the cross-carrier downlink scheduling type of the fifthdownlink subframe on the first carrier and the downlink schedulinginformation.

In the apparatus for receiving downlink scheduling information of theembodiment of the present invention, the downlink scheduling receivingmodule receives, on a fifth subframe on the first carrier, downlinkscheduling information corresponding to the first downlink subframe onthe second carrier. Therefore, at the time of cross-carrier PDCCHscheduling, the PDSCH on the second carrier can be scheduled on thefirst carrier.

The present invention further provides an embodiment of a method forreceiving uplink scheduling information. FIG. 13 is a flow chart ofEmbodiment 1 of a method for receiving uplink scheduling informationprovided by the present invention. As shown in FIG. 13, this embodimentincludes the following steps.

Step 131: A terminal receives, on a sixth downlink subframe that is on afirst carrier and that is at time before time of a first uplinksubframe, uplink scheduling information which is sent by a base stationand is corresponding to the first uplink subframe on a second carrier,in which at time corresponding to a third downlink subframe forscheduling the first uplink subframe on the second carrier duringnon-cross-carrier scheduling, a subframe on a first carrier is an uplinksubframe.

When a physical downlink control channel on a second carrier is borne ona first carrier, the terminal receives, on the downlink subframe on thefirst carrier and at determined time before that of the first uplinksubframe, the uplink scheduling information which is sent by the basestation and is corresponding to the first uplink subframe on the secondcarrier according to the timing relationship between a configuredUL_grant and a PUSCH scheduled by the UL_grant. A subframe with the sametime on the first carrier and of a third downlink subframe forscheduling the first uplink subframe on the second carrier duringnon-cross-carrier scheduling is an uplink subframe. In the embodiment ofthe present invention, the timing relationship between a UL_grant and aPUSCH scheduled by the UL_grant is a new timing relationship between aUL_grant and a PUSCH scheduled by the UL_grant determined by the basestation again in order to schedule, on the first carrier, the uplinkscheduling information on the second carrier when the physical downlinkcontrol channel on the second carrier is borne on the first carrier. Thebase station can deliver a new timing relationship between a UL_grantand a PUSCH scheduled by the UL_grant to the terminal through signaling,and the signaling can be higher-layer signaling such as the RRC or theMAC, layer 1 signaling or layer 2 signaling, such as the PDCCH.Alternatively, a new timing relationship between a UL_grant and a PUSCHscheduled by the UL_grant is pre-configured at two sides of the basestation and the terminal.

Furthermore, when the base station bears the PDCCH on the second carrieronto the first carrier, if a subframe indicator field is added into theuplink scheduling information on the first carrier, the subframeindicator field is used to indicate the uplink subframe on the secondcarrier scheduled by the uplink scheduling information in across-carrier manner, namely, indicate an uplink subframe, on the secondcarrier, on which the uplink data scheduled by the uplink schedulinginformation in a cross-carrier manner is sent to the base station, theterminal can determine, according to an indicator of the subframeindicator field corresponding to the uplink scheduling information,which uplink subframe on the second carrier is scheduled by the uplinkscheduling information in a cross-carrier manner, so as to send, on thecorresponding uplink subframe on the second carrier, the downlink datascheduled by the uplink scheduling information to the base station. Forthe method for the terminal to determine, according to an indicator ofthe subframe indicator field corresponding to the uplink schedulinginformation, which uplink subframe on the second carrier is scheduled bythe uplink scheduling information in a cross-carrier manner, referencecan be made to description in the embodiment corresponding to FIG. 20.

Step 132: The base station sends, on the first uplink subframe on thesecond carrier, uplink data corresponding to the uplink schedulinginformation according to the received uplink scheduling information.

In the method for receiving uplink scheduling information of theembodiment of the present invention, when the PDCCH on the secondcarrier is borne onto the first carrier, the terminal receives, on thesixth subframe on the first carrier, the uplink scheduling informationcorresponding to the first uplink subframe on the second carrier.Therefore, at the time of cross-carrier PDCCH scheduling, the PUSCH onthe second carrier can be scheduled on the first carrier.

Further, the terminal receives, on the sixth downlink subframe on thefirst carrier according to a new timing relationship between a UL_grantcapable of minimizing the scheduling latency and a PUSCH scheduled bythe UL_grant, the uplink scheduling information corresponding to thefirst uplink subframe on the second carrier sent by the base station, inwhich the sixth downlink subframe at time before that of the firstuplink subframe, the latency between the sending time corresponding tothe sixth downlink subframe and that corresponding to the first uplinksubframe on the second carrier is minimum, and the sixth downlinksubframe and the first uplink subframe are at least spaced by Nsubframes; N is the number of subframes which are spaced by betweensending, by the base station, the uplink scheduling information andreceiving, by the base station, the uplink data corresponding to theuplink scheduling information.

Further, the terminal receives, on the sixth downlink subframe that ison the first carrier and that is at time before time of the first uplinksubframe, the uplink scheduling information which is sent by the basestation and is corresponding to the first uplink subframe on the secondcarrier according to the new timing relationship between a UL_grant anda PUSCH scheduled by the UL_grant which can be compromised between theminimization of the scheduling latency and the PDCCH load, and the fifthdownlink subframe bears uplink scheduling information corresponding toat most one first uplink subframe on the second carrier.

The first subframe uplink scheduling the first subframe uplinkscheduling and the second subframe uplink scheduling the second subframeuplink scheduling may simultaneously occur on a downlink subframe on thefirst carrier under the cross-carrier. Further, the terminal receives across-carrier uplink scheduling type of the sixth downlink subframe,wherein the cross-carrier uplink scheduling type is indicated by a newlyadded bit, a newly added scrambling code, a carrier indicator field,transmit power control, or an uplink assignment index in a physicaldownlink control channel; or indicated by RRC signaling, MAC signaling,a search space of a physical downlink control channel or scheduling timeof a physical downlink control channel. The terminal sends, on the firstuplink subframe on the second carrier, the uplink data corresponding tothe uplink scheduling information according to the cross-carrier uplinkscheduling type of the sixth downlink subframe and the downlinkscheduling information.

Further, in order to avoid distinguishing of the first sub-frame uplinkscheduling and the second sub-frame uplink scheduling under thecross-carrier uplink scheduling, the base station can send the uplinkscheduling information to the terminal according to a new timingrelationship between a UL_grant and a PUSCH scheduled by the UL_grant.Therefore, the terminal receives, on the sixth downlink subframe that ison the first carrier and that is at time before time of the first uplinksubframe, the uplink scheduling information which is sent by the basestation and is corresponding to the first uplink subframe on the secondcarrier according to the new timing relationship between a UL_grant anda PUSCH scheduled by the UL_grant. A subframe with the same time on thesecond carrier and of the sixth downlink subframe does not bear theuplink scheduling information during non-cross-carrier scheduling.

The present invention further provides an embodiment of an apparatus forreceiving uplink scheduling information. FIG. 14A is a schematicstructural diagram of Embodiment 1 of an apparatus for receiving uplinkscheduling information provided by the present invention. As shown inFIG. 14A, this embodiment includes: an uplink scheduling receivingmodule 141 and an uplink data sending module 142.

The uplink scheduling receiving module 141 is configured to receive, ona sixth downlink subframe that is on a first carrier and that is at timebefore time of a first uplink subframe, uplink scheduling informationwhich is sent by a base station and is corresponding to the first uplinksubframe on a second carrier, in which at time corresponding to a thirddownlink subframe for scheduling the first uplink subframe on the secondcarrier during non-cross-carrier scheduling, a subframe on a firstcarrier is an uplink subframe.

The uplink data sending module 142 is configured to send, on the firstuplink subframe on the second carrier, uplink data corresponding to theuplink scheduling information according to the received uplinkscheduling information.

The latency between sending time corresponding to the sixth downlinksubframe and sending time corresponding to the first uplink subframe onthe second carrier is minimum, and the sixth downlink subframe and thefirst uplink subframe are spaced by at least N subframes; N is thenumber of subframes which are spaced by between receiving, by aterminal, the uplink scheduling information and sending, by theterminal, the uplink data corresponding to the uplink schedulinginformation. Alternatively, at the time corresponding to the sixthdownlink subframe, a subframe on the second carrier does not bear theuplink scheduling information during non-cross-carrier scheduling.Alternatively, the sixth downlink subframe bears uplink schedulinginformation corresponding to at most one first uplink subframe on thesecond carrier.

FIG. 14B is a schematic structural diagram of Embodiment 2 of theapparatus for receiving uplink scheduling information provided by thepresent invention. As shown in FIG. 14B, on the basis of FIG. 14A, anuplink scheduling type receiving module 143 is further included. Theuplink scheduling type receiving module 143 is configured to receive across-carrier uplink scheduling type of the sixth downlink subframe,wherein the cross-carrier uplink scheduling type is indicated by a newlyadded bit, a newly added scrambling code, a carrier indicator field,transmit power control, or an uplink assignment index in a physicaldownlink control channel; or indicated by radio resource controlsignaling, media access control signaling, a search space of a physicaldownlink control channel or scheduling time of a physical downlinkcontrol channel.

The uplink data sending module 142 is specifically configured to send,on the first uplink subframe on the second carrier, the uplink datacorresponding to the uplink scheduling information according to thecross-carrier uplink scheduling type of the sixth downlink subframe andthe downlink scheduling information.

In the apparatus for receiving uplink scheduling information of theembodiment of the present invention, when the PDCCH on the secondcarrier is borne onto the first carrier, the uplink scheduling receivingmodule receives, on a sixth subframe on the first carrier, uplinkscheduling information corresponding to the first uplink subframe on thesecond carrier. Therefore, at the time of cross-carrier PDCCHscheduling, the PUSCH on the second carrier can be scheduled on thefirst carrier.

Under some specific scenarios, such as a heterogeneous network,interference between a control channel of a macro cell and that of amicro cell is larger; during carrier aggregation (Carrier Aggregation,CA for short), PDCCHs of a plurality of carriers can be placed on partof the carriers, and the macro cell and the micro cell each haveaggregation of two carriers: aggregation of the carrier C1 and thecarrier C2. Two carriers of the two cells are at the same frequency, sothe PDCCH interference is larger. The macro cell can place both thePDCCH of the C1 and the PDCCH of the C2 onto the C2, while the microcell can place both the PDCCH of the C1 and the PDCCH of the C2 onto thecarrier C1, so the PDCCH interference can be reduced so as to furtherensure the PDCCH performance. As shown in FIG. 15, under a configurationof cross-carrier scheduling, the configuration 3 carrier C2 of the basestation of the macro cell is the first carrier, and used to bear aPDCCH, and the configuration 2 carrier C1 of the base station of themicro cell is the first carrier, and used to bear a PDCCH, sointerference between the PDCCHs is reduced through a frequency divisionmanner between the PDCCHs of the two cells.

If the cross-carrier cross-subframe downlink scheduling or thecross-carrier second subframe uplink scheduling is not adopted, sendingof a PDCCH can be switched off by adopting an interfering cell so as tocoordinate the interference. The base stations can be coordinatedthrough coordination between two cells such as a method that the basestation of the macro cell can send coordination information to the basestation of the micro cell or coordination information is configured inadvance through the base station of the micro/macro cell instead ofbeing notified through signaling. The coordination information includesinformation about that the base station of the first cell (such as, thebase station of the macro cell) switches off sending of a PDCCH on asubframe and the base station of the second cell (such as, the basestation of the micro cell) normally sends a PDCCH on a subframe, so thebase station of the macro/micro cell performs does not need to adopt thecross-carrier scheduling on some subframes, and in the above embodiment,the downlink scheduling information corresponding to the first downlinksubframe or the uplink scheduling information corresponding to the firstuplink subframe can be performed according to the existing time sequencebetween a PDCCH &PDSCH and an uplink ACK/NACK or the existing timesequence between a UL_grant and a PUSCH scheduled by the UL_grant on thesame carrier corresponding to scheduled data. The cross-subframedownlink scheduling or the cross-carrier second subframe uplinkscheduling does not need to be introduced into this method, and the timesequence relationship of the existing system is not modified.

As shown in FIG. 15, the subframe 4 of the configuration 2 carrier ofthe macro cell switches off of PDCCH sending, and correspondingly, thesubframe 4 of the configuration 2 carrier of the micro cell can send aPDCCH to schedule the same current carrier (the configuration 2 carrierof the micro cell); by the same token, the subframe 3 of theconfiguration 2 carrier of the micro cell switches off of PDCCH sending,and correspondingly, the subframe 3 of the configuration 2 carrier ofthe macro cell can send a PDCCH to schedule the same current carrier(the configuration 2 carrier of the macro cell).

Additionally, the interfering cell can also adopt same-carriercross-subframe scheduling, and scheduling timing selection can ensurethat ACK/NACK feedback of the subframe with the same time scheduling andACK/NACK feedback of the cross-subframe scheduling are at differentuplink subframes so as to reduce ACK/NACK resource conflict. Forexample, the PDCCH corresponding to the PDSCH downlink scheduling of thesubframe 3 of the configuration 2 carrier of the macro cell can be senton the subframe 8 of the same-carrier (the configuration 2 carrier ofthe macro cell), so the uplink ACK/NACK corresponding to the PDSCH ofthe subframe 8 of the same-carrier subframe with the same timescheduling and the uplink ACK/NACK corresponding to the PDSCH of thesubframe 3 of the same-carrier cross-subframe scheduling are sent ondifferent uplink subframes, which are respectively the uplink subframe 2and the uplink subframe 7, so as to reduce the ACK/NACK resourceconflict, and by introducing the same-carrier cross-subframe scheduling,the sending of PDCCHs on some subframes of the interfering cell does notneed to be switched off, so as to further improve the system throughput.

To solve the scheduling time sequence problem under a scenario ofcross-carrier scheduling of carrier aggregation of differentconfigurations of the TDD, the present invention further includes anembodiment: it is assumed that two TDD carriers are aggregated, the twoTDD carriers can be a first carrier and a second carrier, and uplink anddownlink configurations of the two TDD carriers are different. Under across-carrier scheduling scenario, a PDCCH for scheduling the secondcarrier is sent on the first carrier. At same time, if the first carrieris an uplink subframe while the second carrier is a downlink subframe,the first carrier cannot send the PDCCH to schedule a downlink subframeon the second carrier at this time, and the downlink subframe on thesecond carrier is a first subframe; at this time the second carrier canbe scheduled by adopting the same-carrier, namely, the PDCCH of thefirst subframe on the second carrier is scheduled and sent on the firstsubframe on the second carrier, but the PDCCH is sent on a data area ofthe first subframe on the second carrier, namely, non-control area. Thecontrol area is an area for bearing a PDCCH in an LTE low-releasesystem, can be former n symbols of a subframe, and the data area is anarea for bearing a PDSCH, namely, the (n+1)^(th) symbol to the lastsymbol in the subframe, in which the n is a natural number not greaterthan 4. Alternatively, the PDCCH can be transmitted based on a UEspecific reference signal, namely, transmitted in a manner based onchannel information precoding.

The present invention further includes the following embodiment.

The TDD system adopts the carrier aggregation technology, and if twoaggregated carriers are located at different frequency bands, eachcarrier can adopt an independent uplink and downlink configuration. Iftwo carriers of the TDD system adopt different uplink and downlinkconfigurations, for same time, subframes with inconsistent transmissiondirections exist for the two carriers, namely, for one carrier, namely,the first carrier, the up is an uplink subframe, and simultaneously forthe other carrier, namely, the second carrier, the up is a downlinksubframe; at this time, in order to simplify implementation of the UEand enable the UE not to support simultaneous receiving and sending,namely, the UE can only receive this type of subframes with inconsistenttransmission directions on the second carrier and cannot send thesubframes on the first carrier; at this time, the uplink ACK/NACK cannotbe sent on the first carrier, namely, the downlink subframecorresponding to the ACK/NACK cannot be scheduled; or, the subframes canonly be sent on the first carrier and cannot be received on the secondcarrier, namely, the second carrier cannot be scheduled to performdownlink transmission.

Directions of inconsistent subframes are selected to enable the useefficiency of a subframe to be improved, and the following method can beadopted.

For subframes with inconsistent transmission directions on differentcarriers at same time, for example, at same time, a main carrier is anuplink subframe, and an auxiliary carrier is a downlink subframe. Ifuplink acknowledgment/negative acknowledgment information (ACK/NACK) isnot sent on the uplink subframe on the main carrier according to aconfigured time sequence relationship, the subframes with inconsistenttransmission directions adopt the downlink direction at this time,namely, for the subframes with inconsistent transmission directions ondifferent carriers at the same time, the UE receives data and/or controlinformation on a downlink subframe on the same time, and sends no dataand/or control information at the same time. For example, if the TDDconfiguration of the main carrier is the configuration 0, and the TDDconfiguration of the auxiliary carrier is the configuration 2, all ofsubframes 3, 4, 8, and 9 are subframes with inconsistent transmissiondirections, namely, these four subframes of the main carrier are uplinksubframes, and these four subframes of the auxiliary carrier aredownlink subframes; also, according to a configured time sequencerelationship, no uplink ACK/NACK is borne on the uplink subframes 3 and8 of the main carrier, so at this time, for this type of subframes 3 and8 with inconsistent transmission directions, it can be specified thatthe UE receives data and/or control information on the auxiliarycarrier, and sends no data and/or control information on the maincarrier.

FIG. 16A is a flow chart of Embodiment 6 of the method for sendingdownlink scheduling information provided by the present invention. Themethod provided by this embodiment can distinguish cross-carrierscheduling types at the time of scheduling a DL_Grant in a cross-carriermanner on the first carrier. As shown in FIG. 16A, this embodimentincludes the following steps.

Step 161: A base station determines, in downlink subframes on a secondcarrier, a first downlink subframe, in which at time corresponding tothe first downlink subframe, a subframe on a first carrier is an uplinksubframe.

Step 162: The base station determines, according to a first timesequence relationship, all downlink subframes corresponding to a maximumnumber of uplink ACK/NACKs which a third uplink subframe on the secondcarrier is capable of feeding back, and determines a downlink subframeat the earliest scheduling time of all the downlink subframes, in whichthe downlink subframe at the earliest scheduling time is a subframe onthe second carrier at the same time as that of the fifth downlinksubframe on the first carrier.

Step 163: The base station sends, on a fifth downlink subframe on thefirst carrier, downlink scheduling information corresponding to thefirst downlink subframe on the second carrier to a terminal, in whichthe downlink scheduling information sent on the fifth downlink subframeon the first carrier includes a downlink assignment indication, wherethe downlink assignment indication is used to indicate a cross-carrierdownlink scheduling type on the fifth downlink subframe on the firstcarrier to the terminal.

At time corresponding to the first downlink subframe on the secondcarrier, a subframe on the first carrier is an uplink subframe, so theDL_Grant on the first downlink subframe on the second carrier cannot besent on subframe with the same time on the first carrier. In order todistinguish cross-carrier scheduling types at the time of scheduling aDL_Grant in a cross-carrier manner on the first carrier, the DL_Grantcorresponding to the first downlink subframe on the second carrier canbe configured onto the fifth downlink subframe that is on the firstcarrier and that is at time before time of the first downlink subframeand be sent, and the cross-carrier downlink scheduling type of the fifthdownlink subframe on the first carrier is indicated to the terminalthrough the DL DAI of the fifth downlink subframe. At this time, thefifth downlink subframe on the first carrier is determined according toa method as follows: determining, according to a first time sequencerelationship, all downlink subframes corresponding to a maximum numberof uplink ACK/NACKs which a third uplink subframe on the second carrieris capable of feeding back, and determining a downlink subframe at theearliest scheduling time of all the downlink subframes, in which thedownlink subframe at the earliest scheduling time is a subframe on thesecond carrier at the same time as that of the fifth downlink subframeon the first carrier. The first time sequence relationship is an uplinkACK/NACK time sequence relationship when the second carrier is solelyconfigured.

During independent scheduling of the second carrier, which can also beunderstood as during non-cross-carrier scheduling of the second carrier,the second carrier is used to feed back an uplink ACK/NACK, namely, thesecond carrier is solely configured and does not need to be scheduled byother carriers in a cross-carrier manner. For example, the terminal isonly configured with one carrier: the second carrier, and an uplinkACK/NACK corresponding to a downlink subframe on the second carrier isfed back on the second carrier. When the second carrier is used to feedback an ACK/NACK, all downlink subframes corresponding to uplinkACK/NACKs which the third uplink subframe on the second carrier iscapable of feeding back can be understood as an ACK/NACK feedback windowof the third uplink subframe on the second carrier. For example, ifdownlink subframes corresponding to a maximum number of uplink ACK/NACKswhich the uplink subframe 2 on the TDD configuration 2 carrier iscapable of feeding back are downlink subframes 4, 5, 6 and 8, theACK/NACK feedback window of the uplink subframe 2 includes these fourdownlink subframes 4, 5, 6 and 8. Even if the base station onlyschedules a part of these four subframes, the feedback window stillincludes four subframes, which does not depend on the number ofscheduled subframes. A subframe on the second carrier and at time sameas that of the fifth downlink subframe on the first carrier is asubframe at the earliest scheduling time when the second carrier isscheduled by the first carrier in a cross-carrier manner in the ACK/NACKfeedback window of the third uplink subframe on the second carrier whenthe second carrier is solely configured.

In the prior art, through two bits of DL DAI in a DL_grant on a downlinksubframe, the sequence at which the downlink subframe is scheduled in anACK/NACK feedback window of an uplink subframe corresponding to thedownlink subframe is distinguished, that is, the sequence at which theDL_Grant is received is identified. When the first carrier schedules thesecond carrier in a cross-carrier manner, a subframe on the secondcarrier and at time same as that of the fifth downlink subframe on thefirst carrier, namely, a subframe with the same time on the secondcarrier and of the fifth downlink subframe on the first carrier, is asubframe at the earliest scheduling time in the uplink ACK/NACK feedbackwindow of the third uplink subframe on the second carrier, the terminalreceives a cross-carrier DL_grant from the fifth downlink subframe onthe first carrier, can determine that the DL_grant is a DL_grant at theearliest scheduling time in an ACK/NACK feedback window of an uplinksubframe, and can confirm by default that the value of the DL DAI in theDL_grant is 1, and the scheduling sequence indicating the DL_grant doesnot need to be displayed through the value of the DL DAI, so the DL DAIof the DL_grant can be used for distinguishing the cross-carrierdownlink scheduling type. The specific distinguishing method is: if thevalue of the DL DAI is “01”, it denotes that what is scheduled by acorresponding DL_grant is a subframe with the same time of thecross-carrier, which is the subframe with the same time downlinkscheduling under the cross-carrier scheduling; if the value of the DLDAI is “10”, it denotes that what is scheduled by a correspondingDL_grant is a cross subframe on the cross-carrier, which is thecross-subframe downlink scheduling under the cross-carrier scheduling;if the value of the DL DAI is “11”, it denotes that what is scheduled bya corresponding DL_grant is a subframe with the same time and a crosssubframe on the cross-carrier, which is the subframe with the same timedownlink scheduling under the cross-carrier scheduling and thecross-subframe downlink scheduling under the cross-carrier scheduling.Additionally, other denotation methods can also be used, and theembodiment of the present invention imposes no limitation. If the numberof subframes of cross-subframe scheduling is greater than 1, thecross-subframe scheduling can also be bound. For example, if the valueof the DL DAI is “01”, it denotes that what is scheduled by acorresponding DL_grant is a subframe with the same time of thecross-carrier, which is the subframe with the same time downlinkscheduling under the cross-carrier scheduling; if the value of the DLDAI is “10”, it denotes that a corresponding DL_grant schedules aplurality of cross subframes under the cross-carrier, which is downlinkscheduling of a plurality of cross subframes under the cross-carrierscheduling; if the value of the DL DAI is “11”, it denotes that what acorresponding DL_grant schedules a subframe with the same time under thecross-carrier scheduling and a plurality of cross subframes under thecross-carrier, which is the subframe with the same time downlinkscheduling and the downlink scheduling of a plurality of cross subframesunder the cross-carrier scheduling.

According to a timing relationship between a PDCCH/PDSCH on a secondcarrier and an uplink ACK/NACK shown in FIG. 16B, during independentscheduling of the second carrier, a subframe for feeding back theACK/NACK corresponding to the downlink subframe 8 is the uplink subframe2, and the uplink ACK/NACK feedback window of the uplink subframe 2 is4, 5, 6 and 8. For example, if the base station schedules all thedownlink subframes in the feedback window, the value of the DL DAI inthe DL_Grant of the downlink subframe 4 is 1, the value of the DL DAI inthe DL_Grant of the downlink subframe 5 is 2, the value of the DL DAI inthe DL_Grant of the downlink subframe 6 is 3, and the value of the DLDAI in the DL_Grant of the downlink subframe 8 is 4, the terminal needsto feed back an ACK/NACK corresponding to each of the downlink subframes4, 5, 6 and 8 to the base station on the uplink subframe 2; if the basestation sends no DL_Grant on the downlink subframe 4, and only sends aDL_Grant on each of the downlink subframes 5, 6 and 8, the terminal onlyfeeds back an uplink ACK/NACK corresponding to each of the DL_Grants onthe downlink subframe 5, 6 and 8 to the base station on the uplinksubframe 2, and does not need to feed back the ACK/NACK corresponding tothe DL_Grant on the downlink subframe 4 to the base station on theuplink subframe 2. At this time, the base station only schedules a partof these four subframes 4, 5, 6 and 8, but the uplink ACK/NACK feedbackwindow of the uplink subframe 2 is still 4, 5, 6 and 8, and the uplinkACK/NACK feedback window of the uplink subframe does not depend on thenumber of subframes scheduled by the base station. Therefore, theACK/NACK feedback window of the uplink subframe 2 is defined as all thedownlink subframes corresponding to the ACK/NACKs which the uplinksubframe 2 is capable of feeding back.

As shown in FIG. 16C, under a scenario that the first carrier schedulesthe second carrier in a cross-carrier manner, the subframe 8 on thefirst carrier and at time the same as that of the downlink subframe 8 onthe second carrier is an uplink subframe. Therefore, the downlinksubframe 8 on the second carrier cannot be scheduled through the uplinksubframe 8 of the first carrier. Any one uplink subframe is determinedon the second carrier, and the uplink ACK/NACK feedback window of theuplink subframe is determined when the second carrier is used to feedback the uplink ACK/NACK. Later, a subframe at the earliest schedulingtime when the second carrier is scheduled by the first carrier in across-carrier manner is determined in the ACK/NACK feedback window ofthe uplink subframe, the DL_grant for scheduling the downlink subframe 8of the second carrier can be adjusted onto the subframe at the earliestscheduling time and be sent, and a subframe with the same time on thefirst carrier and of the subframe at the earliest scheduling time isbefore the time of the downlink subframe 8.

For example, the uplink subframe 2 is determined on the second carrier,and the ACK/NACK feedback window of the uplink subframe 2 is 4, 5, 6 and8. When the first carrier schedules the second carrier in across-carrier manner, the subframe at the earliest scheduling time ofall the downlink subframes in the ACK/NACK feedback window of the uplinksubframe 2 is the downlink subframe 4, the DL_grant for scheduling thedownlink subframe 8 of the second carrier can be adjusted onto thedownlink subframe 4 of the first carrier, and the time of the downlinksubframe 4 of the first carrier is before that of the downlink subframe8 of the second carrier. When receiving the DL_grant of thecross-carrier scheduling on the downlink subframe 4 of the firstcarrier, the terminal can determine that the DL_grant is the DL_grant atthe earliest scheduling time in the uplink ACK/NACK feedback window ofan uplink subframe on the second carrier, and the value of the DL DAI inthe DL_grant can be 1 by default. The DL DAI of the downlink subframe 4of the first carrier is adopted to distinguish the cross-carrierscheduling type on the downlink subframe 4 of the first carrier, namely,distinguish whether the DL_grant on the downlink subframe 4 of the firstcarrier schedules a subframe with the same time of the second carrier,or a cross subframe on the second carrier in a cross-carrier manner, orschedules a subframe with the same time and a cross subframe on thesecond carrier simultaneously.

Furthermore, as shown in FIG. 16B, the uplink subframe 7 is determinedon the second carrier, and because the base station sends a DL_Grant oneach of the downlink subframes 9, 0, 1 and 3 of the first carrier whenthe second carrier is used to feed back an ACK/NACK, the ACK/NACKfeedback window of the uplink subframe 7 is the downlink subframes 9, 0,1 and 3. When the first carrier schedules the second carrier in across-carrier manner, the subframe at the earliest scheduling time ofall the downlink subframes in the ACK/NACK feedback window of the uplinksubframe 7 is the downlink subframe 9, the DL_grant for scheduling thedownlink subframe 8 of the second carrier can also be adjusted onto thedownlink subframe 9 of the first carrier, and the time of the downlinksubframe 9 of the first carrier is before that of the downlink subframe8 of the second carrier. The sending the DL_grant of the downlinksubframe 8 of the second carrier on the downlink subframe 4 of the firstcarrier is compared with the sending the DL_grant of the downlinksubframe 8 of the second carrier on the downlink subframe 9 of the firstcarrier, and the latency between from sending, by the base station, theDL_Grant on the first carrier to the terminal to receiving, by theterminal, the PDSCH scheduled by the DL_Grant on the second carrier isshorter.

As shown in FIG. 16C, under a scenario that the first carrier schedulesthe second carrier in a cross-carrier manner, the subframe 4 on thefirst carrier and at time the same as that of the downlink subframe 4 onthe second carrier is an uplink subframe. Therefore, the downlinksubframe 4 on the second carrier cannot be scheduled through a subframewith the same time on the first carrier, namely, the uplink subframe 4of the first carrier. When the second carrier is used to feed back theuplink ACK/NACK, the ACK/NACK feedback window of the uplink subframe 2is 4, 5, 6 and 8. When the first carrier schedules the second carrier ina cross-carrier manner, the downlink subframe 5 on the second carrierbecomes the downlink subframe at the earliest scheduling time in theACK/NACK feedback window of the uplink subframe 2, and the DL_grant forscheduling the downlink subframe 4 of the second carrier can be adjustedonto the downlink subframe 5 of the first carrier. The cross-carrierdownlink scheduling type is distinguished through the DL DAI in theDL_grant of the cross-carrier scheduling on the downlink subframe 5 ofthe first carrier.

As shown in FIG. 16D, under a scenario that the first carrier schedulesthe second carrier in a cross-carrier manner, the subframe 7 on thefirst carrier and at time the same as that of the downlink subframe 7 onthe second carrier is an uplink subframe. Therefore, the downlinksubframe 7 on the second carrier cannot be scheduled through a subframewith the same time on the first carrier. The uplink subframe 2 can bedetermined on the second carrier, and when the second carrier is used tofeed back the uplink ACK/NACK, the ACK/NACK feedback window of theuplink subframe 2 is 1, 5 and 6. When the first carrier schedules thesecond carrier, the subframe at the earliest scheduling time of all thedownlink subframes in the uplink ACK/NACK feedback window of the uplinksubframe 2 is the downlink subframe 1, the DL_grant for scheduling thedownlink subframe 7 of the second carrier can be adjusted onto thedownlink subframe 1 of the first carrier, and the time of the downlinksubframe 1 of the first carrier is before that of the downlink subframe7 of the second carrier. The cross-carrier downlink scheduling type onthe downlink subframe 1 of the first carrier is distinguished byadopting the DL DAI in the DL_grant on the downlink subframe 1 of thefirst carrier. Furthermore, the uplink subframe 4 can also be determinedon the second carrier, and when the second carrier is used to feed backthe uplink ACK/NACK, the ACK/NACK feedback window of the uplink subframe4 is 0 and 9. When the first carrier schedules the second carrier, thesubframe at the earliest scheduling time of all the downlink subframesin the uplink ACK/NACK feedback window of the uplink subframe 4 is thedownlink subframe 0, the DL_grant for scheduling the downlink subframe 7of the second carrier can be adjusted onto the downlink subframe 0 ofthe first carrier, and the cross-carrier downlink scheduling type on thedownlink subframe 1 of the first carrier is distinguished through the DLDAI in the DL_grant on the downlink subframe 1 of the first carrier.Furthermore, the uplink subframe 3 can also be determined on the secondcarrier, and when the second carrier is used to feed back the ACK/NACK,the uplink ACK/NACK feedback window of the uplink subframe 4 is 7 and 8.When the first carrier schedules the second carrier, the subframe at theearliest scheduling time of all the downlink subframes in the uplinkACK/NACK feedback window of the uplink subframe 3 is the downlinksubframe 8, the DL_grant for scheduling the downlink subframe 7 of thesecond carrier can be adjusted onto the downlink subframe 8 of the firstcarrier, and the cross-carrier downlink scheduling type on the downlinksubframe 8 of the first carrier is distinguished through the DL DAI inthe DL_grant on the downlink subframe 8 of the first carrier.

In the prior art, if at time corresponding to the downlink subframe A onthe second carrier, a subframe on the first carrier is a downlinksubframe, when a PDCCH on a second carrier is borne on a first carrier,the base station only sends, on subframe with the same time of thedownlink subframe A and on the first carrier, namely, a downlinksubframe on the first carrier and at time the same as that of thedownlink subframe A, the downlink scheduling information correspondingto the downlink subframe A on the second carrier to the terminal. In thefollowing embodiment for sending downlink scheduling information, thebase station can send, on a subframe with the same time of the downlinksubframe A and on the first carrier, namely, a downlink subframe on thefirst carrier and at time the same as that of the downlink subframe A,or on a downlink subframe that is on the first carrier and that is attime before time of the downlink subframe A, the downlink schedulinginformation corresponding to the downlink subframe A on the secondcarrier to the terminal.

FIG. 17A is a flow chart of Embodiment 7 of the method for sendingdownlink scheduling information provided by the present invention. Asshown in FIG. 17A, this embodiment includes the following steps.

Step 171: A base station determines, in downlink subframes on a secondcarrier, a downlink subframe A.

Step 172: The base station sends, on a downlink subframe B on a firstcarrier, downlink scheduling information of a downlink subframe A on asecond carrier to a terminal, in which if a subframe on the firstcarrier at time the same as that of the downlink subframe A on thesecond carrier is an uplink subframe, time corresponding to the downlinksubframe B is before the time corresponding to the downlink subframe A;or if a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is a downlink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A, or time corresponding to thedownlink subframe B is the same time as the time corresponding to thedownlink subframe A.

If a subframe with the same time on the first carrier and of thedownlink subframe A on the second carrier, namely, a subframe on thefirst carrier and at time the same as that of the downlink subframe A onthe second carrier, is an uplink subframe, the downlink subframe B attime before that of the downlink subframe A is determined on the firstcarrier, and the downlink scheduling information corresponding to thedownlink subframe A on the second carrier is sent to the terminal on thedownlink subframe B of the first carrier. As shown in FIG. 16C, thedownlink scheduling information corresponding to the downlink subframe 4on the second carrier is adjusted onto the downlink subframe 1 on thefirst carrier and is sent. The downlink scheduling informationcorresponding to the downlink subframe 9 on the second carrier isadjusted onto the downlink subframe 6 on the first carrier and is sent.

If a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is a downlink subframe, thebase station can send, on a subframe with the same time of the downlinksubframe A and on the first carrier, namely, a downlink subframe on thefirst carrier and at time the same as that of the downlink subframe A,the downlink scheduling information corresponding to the downlinksubframe A on the second carrier to the terminal. As shown in FIG. 17B,the downlink scheduling information corresponding to the downlinksubframe 0 on the first carrier can be sent to the terminal on thedownlink subframe 0 on the first carrier.

If at time corresponding to the downlink subframe A on the secondcarrier, a subframe on the first carrier is a downlink subframe, thebase station can also send, on a downlink subframe that is on the firstcarrier and that is at time before time of the downlink subframe A, thedownlink scheduling information corresponding to the downlink subframe Aon the second carrier to the terminal. As shown in FIG. 16B, the basestation can send the downlink scheduling information corresponding tothe downlink subframe 1 on the second carrier to the terminal on thedownlink subframe 0 on the first carrier, and the base station can sendthe downlink scheduling information corresponding to the downlinksubframe 6 on the second carrier to the terminal on the downlinksubframe 5 on the first carrier.

Further, the base station indicates a downlink subframe on the secondcarrier scheduled by the downlink scheduling information in across-carrier manner to the terminal through a subframe indicator fieldin the downlink scheduling information, so when receiving, on the firstcarrier, the downlink scheduling information of the second carrier, theterminal determines a downlink subframe, of the second carrier, on whichthe downlink data scheduled by the downlink scheduling information isreceived. The subframe indicator field in the downlink schedulinginformation on the first carrier at least includes at least one of afirst value, a second value, a third value and a fourth value.

For example, a bit can be newly added into the PDCCH on the firstcarrier, and a downlink subframe, on the second carrier, on which thedownlink data is scheduled in a cross-carrier manner by the downlinkscheduling information on the first carrier is indicated through thenewly added bit. The newly added bit is referred to as a subframeindicator field (Sub-frame Indicator Field, SIF for short). Taking a TDDsystem as an example, the newly added SIF in the downlink schedulinginformation is two bits, the first value can be 00, the second value canbe 01, the third value can be 10, and the fourth value can be 11. Thatthe value of the subframe indicator field is 00 denotes that timecorresponding to the downlink subframe A on the second carrier scheduledby the downlink scheduling information in a cross-carrier manner is thesame as that corresponding to the downlink subframe B on the firstcarrier; that the value of the subframe indicator field is 01 denotesthat the downlink subframe A on the second carrier scheduled by thedownlink scheduling information in a cross-carrier manner is the firstdownlink subframe lagging behind the time corresponding to the downlinksubframe B on the first carrier, namely, the downlink subframe A of thesecond carrier is the first downlink subframe lagging behind a subframewith the same time on the second carrier and of the downlink subframe Bon the first carrier; that the value of the subframe indicator field is10 denotes that the downlink subframe A on the second carrier scheduledby the downlink scheduling information in a cross-carrier manner is thesecond downlink subframe lagging behind the time corresponding to thedownlink subframe B on the first carrier; that the value of the subframeindicator field is 11 denotes that the downlink subframe A on the secondcarrier scheduled by the downlink scheduling information in across-carrier manner is the third downlink subframe lagging behind thetime corresponding to the downlink subframe B on the first carrier.

The base station indicates a downlink subframe on the second carrierscheduled by the downlink scheduling information in a cross-carriermanner to the terminal through a downlink assignment indication(Downlink Assignment Indication, DL DAI for short) in the downlinkscheduling information, and the specific indication method is the sameas the method for performing indication through an SIF. For example,that the value of the DL DAI is 00 denotes that time corresponding tothe downlink subframe A on the second carrier scheduled by the downlinkscheduling information in a cross-carrier manner is the same as thatcorresponding to the downlink subframe B on the first carrier; that thevalue of the DL DAI is 01 denotes that the downlink subframe A on thesecond carrier scheduled by the downlink scheduling information in across-carrier manner is the first downlink subframe lagging behind thetime corresponding to the downlink subframe B on the first carrier,namely, the downlink subframe A of the second carrier is the firstdownlink subframe lagging behind a subframe with the same time on thesecond carrier and of the downlink subframe B on the first carrier; thatthe value of the DL DAI is 10 denotes that the downlink subframe A onthe second carrier scheduled by the downlink scheduling information in across-carrier manner is the second downlink subframe lagging behind thetime corresponding to the downlink subframe B on the first carrier; thatthe value of the DL DAI is 11 denotes that the downlink subframe A onthe second carrier scheduled by the downlink scheduling information in across-carrier manner is the third downlink subframe lagging behind thetime corresponding to the downlink subframe B on the first carrier.

FIG. 17B and FIG. 17C below are taken as an example to illustrate how toindicate, in the DL-Grant of the cross-carrier scheduling, a downlinksubframe on the second carrier scheduled by the DL-Grant in across-carrier manner, namely, how to indicate a downlink subframe, onthe second carrier, on which the downlink data scheduled by the DL-Grantin a cross-carrier manner is located.

As shown in FIG. 17B, the base station sends the DL-Grant correspondingto the downlink subframe 1 on the second carrier to the terminal on thedownlink subframe 0 on the first carrier. The downlink subframe 1 on thesecond carrier is the first downlink subframe lagging behind a subframewith the same time on the second carrier and of the downlink subframe 0on the first carrier, so the base station sets, in the PDCCH of thedownlink subframe 0 on the first carrier, the value of the SIFcorresponding to the DL-Grant corresponding to the downlink subframe 1on the second carrier scheduled in a cross-carrier manner to 01.

As shown in FIG. 17C, subframes on the first carrier at the same time asthat of downlink subframes 3, 4, 8 and 9 on the second carrier areuplink subframes, namely, subframes with the same time on the firstcarrier and of the downlink subframes 3, 4, 8 and 9 on the secondcarrier are uplink subframes. During cross-carrier scheduling, thedownlink scheduling information corresponding to the downlink subframes3, 4, 8 and 9 of the second carrier is sent on the first carrier. TheDL-Grant corresponding to the downlink subframe 3 of the second carriercan be adjusted onto the downlink subframe 0 on the first carrier in across-subframe manner and be borne; the DL-Grant corresponding to thedownlink subframe 4 of the second carrier can be adjusted onto thedownlink subframe 1 on the first carrier in a cross-subframe manner andbe borne; the DL-Grant corresponding to the downlink subframe 8 of thesecond carrier can be adjusted onto the downlink subframe 5 on the firstcarrier in a cross-subframe manner and be borne; the DL-Grantcorresponding to the downlink subframe 9 of the second carrier can beadjusted onto the downlink subframe 6 on the first carrier in across-subframe manner and be borne.

After the DL-Grant corresponding to the downlink subframe 3 of thesecond carrier is adjusted onto the downlink subframe 0 on the firstcarrier in a cross-subframe manner and be borne, the downlink subframe 0on the first carrier bears the DL-Grant corresponding to the downlinksubframe 0 on the first carrier, the DL-Grant corresponding to thedownlink subframe 0 on the second carrier (cross-carrier subframe withthe same time scheduling), and the DL-Grant corresponding to thedownlink subframe 3 on the second carrier (cross-carrier cross-subframescheduling). The base station sets, in the PDCCH of the downlinksubframe 0 on the first carrier, the value of the SIF corresponding tothe DL-Grant corresponding to the downlink subframe 0 on the secondcarrier scheduled in a cross-carrier manner to 00, and the value of theSIF corresponding to the DL-Grant corresponding to the downlink subframe3 on the second carrier to 11. By the same token, the base station sets,on the downlink subframe 1 on the first carrier, the value of the SIFcorresponding to the DL-Grant corresponding to the downlink subframe 1on the second carrier scheduled in a cross-carrier manner to 00, and thevalue of the SIF corresponding to the DL-Grant corresponding to thedownlink subframe 4 on the second carrier to 11. By the same token, thebase station sets, on the downlink subframe 5 on the first carrier, thevalue of the SIF corresponding to the downlink scheduling informationcorresponding to the downlink subframe 5 on the second carrier scheduledin a cross-carrier manner to 00, and the value of the SIF correspondingto the DL-Grant corresponding to the downlink subframe 8 on the secondcarrier to 11. By the same token, the base station sets, on the downlinksubframe 6 on the first carrier, the value of the SIF corresponding tothe DL-Grant corresponding to the downlink subframe 6 on the secondcarrier scheduled in a cross-carrier manner to 00, and the value of theSIF corresponding to the DL-Grant corresponding to the downlink subframe9 on the second carrier to 11.

In the method for sending downlink scheduling information of theembodiment of the present invention, when a first carrier bears a PDCCHon a second carrier, if at time corresponding to a downlink subframe Aon the second carrier, a subframe on the first carrier is an uplinksubframe, a base station sends, on a downlink subframe B on the firstcarrier whose time is before the time corresponding to the downlinksubframe A, downlink scheduling information corresponding to thedownlink subframe A on the second carrier to a terminal, so when thefirst carrier schedules the second carrier in a cross-carrier manner,the base station can send, on the first carrier, downlink schedulinginformation for scheduling the PDSCH on the second carrier to theterminal. If at time corresponding to the downlink subframe A on thesecond carrier, a subframe on the first carrier is a downlink subframe,the base station can send, on the downlink subframe B on the firstcarrier whose time is before the time corresponding to the downlinksubframe A, downlink scheduling information corresponding to thedownlink subframe A on the second carrier to the terminal, or can alsosend, on the downlink subframe A of the first carrier, the downlinkscheduling information corresponding to the downlink subframe A on thesecond carrier to the terminal. Further, the base station furtherindicates a downlink subframe on the second carrier scheduled by thedownlink scheduling information in a cross-carrier manner to theterminal through a newly added subframe indicator field in the downlinkscheduling information, so when receiving, on the first carrier, thedownlink scheduling information of the second carrier, the terminaldetermines a downlink subframe, of the second carrier, on which thedownlink data scheduled by the downlink scheduling information isreceived.

FIG. 18 is a flow chart of Embodiment 2 of the method for receivingdownlink scheduling information provided by the present invention. Thisembodiment illustrates how the terminal receives, on a correspondingdownlink subframe on the second carrier, the downlink data correspondingto the downlink scheduling information according to a subframe indicatorfield after the base station adds, in a PDCCH, the subframe indicatorfield for the downlink scheduling information in the embodimentcorresponding to FIG. 17A. As shown in FIG. 18, this embodiment includesthe following steps.

Step 181: A terminal receives, on a downlink subframe B on a firstcarrier, downlink scheduling information, of a downlink subframe A on asecond carrier, sent by a base station, in which if a subframe on thefirst carrier at time the same as that of the downlink subframe A on thesecond carrier is an uplink subframe, time corresponding to the downlinksubframe B is before the time corresponding to the downlink subframe A;or If a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is a downlink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A, or time corresponding to thedownlink subframe B is the same time as the time corresponding to thedownlink subframe A.

Step 182: The terminal receives, on the downlink subframe A on thesecond carrier, downlink data corresponding to the downlink schedulinginformation according to the received downlink scheduling information.

As shown in FIG. 17B, in combination with the embodiment correspondingto FIG. 16A, after the DL-Grant corresponding to the downlink subframe 3of the second carrier is adjusted onto the downlink subframe 0 on thefirst carrier in a cross-subframe manner and be borne, the base stationsets, in the PDCCH of the downlink subframe 0 on the first carrier, thevalue of the SIF corresponding to the DL-Grant of the PDSCH on thedownlink subframe 0 on the second carrier scheduled in a cross-carriermanner to 00, and the value of the SIF corresponding to the DL-Grant ofthe PDSCH on the downlink subframe 3 on the second carrier to 11. Theterminal receives, on the PDCCH of the downlink subframe 0 on the firstcarrier, DL-Grants of three PDSCHs. The value of the SIF correspondingto one DL-Grant thereof is 00, the terminal can determine that thedownlink subframe on the second carrier scheduled by the DL-Grant in across-carrier manner is a subframe with the same time on the secondcarrier and of the downlink subframe 0 on the first carrier, namely, thedownlink subframe on the second carrier scheduled by the DL-Grant in across-carrier manner is at time the same as that of the downlinksubframe 0 on the first carrier, and the PDSCH scheduled by the DL-Grantis received on the downlink subframe 0 of the second carrier; the valueof the SIF corresponding to another DL-Grant thereof is 11, the terminalcan determine that the downlink subframe on the second carrier scheduledby the DL-Grant in a cross-carrier manner is the third downlink subframeat time lagging behind the time corresponding to the downlink subframe 0on the first carrier, and the downlink scheduling data scheduled by theDL-Grant is received on the downlink subframe 3 of the second carrier;still another DL-Grant has no corresponding SIF, and the terminaldetermines that the DL-Grant schedules the PDSCH of the downlinksubframe 0 on the first carrier in a subframe with the same timescheduling manner under the same-carrier scheduling.

In the method for receiving downlink scheduling information of theembodiment of the present invention, when a first carrier bears a PDCCHon a second carrier, if a subframe on the first carrier at time the sameas that corresponding to the downlink subframe A on the second carrieris an uplink subframe, the terminal device receives, on the downlinksubframe B on the first carrier whose time is before the timecorresponding to the downlink subframe A, downlink schedulinginformation corresponding to the downlink subframe A on the secondcarrier sent by the base station, so when the first carrier schedulesthe second carrier in a cross-carrier manner, the base station can send,on the first carrier, downlink scheduling information for scheduling thePDSCH on the second carrier to the terminal. If a subframe on the firstcarrier at time the same as that corresponding to the downlink subframeA on the second carrier is a downlink subframe, the terminal canreceive, on the downlink subframe B on the first carrier whose time isbefore the time corresponding to the downlink subframe A, downlinkscheduling information corresponding to the downlink subframe A on thesecond carrier sent by the base station, or can also send, on thedownlink subframe A of the first carrier, the downlink schedulinginformation corresponding to the downlink subframe A on the secondcarrier to the terminal. Further, the base station further indicates adownlink subframe on the second carrier scheduled by the downlinkscheduling information in a cross-carrier manner to the terminal througha newly added subframe indicator field in the downlink schedulinginformation, so when receiving, on the first carrier, the downlinkscheduling information of the second carrier, the terminal determines adownlink subframe, of the second carrier, on which the downlink datascheduled by the downlink scheduling information is received.

In the following embodiment for sending uplink scheduling information,if at time corresponding to the downlink subframe E for scheduling theuplink subframe C on the second carrier during non-cross-carrierscheduling, a subframe on a first carrier is a downlink subframe, thebase station can send the UL_grant for scheduling the uplink subframe Con the second carrier to the terminal on the downlink subframe E of thefirst carrier, and the base station can also send, on any one downlinksubframe on the first carrier, the UL_grant for scheduling the uplinksubframe C on the second carrier to the terminal, in which the downlinksubframe is at time before that of the uplink subframe C of the secondcarrier and satisfies the minimum scheduling interval: N subframesbetween the downlink subframe and the uplink subframe C of the secondcarrier. However, in the prior art, the base station can only send theUL_grant for scheduling the uplink subframe C on the second carrier tothe terminal on the downlink subframe E of the first carrier.

FIG. 19A is a flow chart of Embodiment 5 of the method for sendinguplink scheduling information provided by the present invention. Asshown in FIG. 19A, this embodiment includes the following steps.

Step 191: A base station determines, in uplink subframes on a secondcarrier, an uplink subframe C.

Step 192: The base station sends, on a downlink subframe D on a firstcarrier, uplink scheduling information of the downlink subframe C on thesecond carrier to a terminal, in which an interval between timecorresponding to a subframe E on the first carrier and timecorresponding to the uplink subframe C is a scheduling interval: Nsubframes, and if the subframe E is a downlink subframe, the downlinksubframe D and the subframe E are subframes with the same time, or thedownlink subframe D is before the subframe E; or if the subframe E is anuplink subframe, the downlink subframe D is before the subframe E; and Nis the number of subframes at least which are spaced by betweenreceiving, by a terminal, the uplink scheduling information and sending,by the terminal, the uplink data corresponding to the uplink schedulinginformation.

The interval between the time corresponding to the subframe E on thefirst carrier and the time corresponding to the uplink subframe C is thescheduling interval: N subframes, and if the subframe E is a downlinksubframe, the base station can send, on the subframe E of the firstcarrier, or on a downlink subframe that is on the first carrier and thatis at time before time of the subframe E, the uplink schedulinginformation for scheduling the uplink subframe C on the second carrierto the terminal; or if the subframe E is an uplink subframe, the basestation can send, on a downlink subframe that is on the first carrierand that is at time before time of the subframe E, the uplink schedulinginformation for scheduling the uplink subframe C on the second carrierto the terminal.

When at time corresponding to the downlink subframe for scheduling theuplink subframe C, a subframe on the first carrier is the uplinksubframe G during non-cross-carrier scheduling of the second carrier,namely, individual configuration, if the uplink subframe G and theuplink subframe C are spaced by N subframes, the downlink subframe D isbefore the uplink subframe G; if the uplink subframe G and the uplinksubframe C are spaced by more than N subframes, and the subframe E, onthe first carrier, satisfying the minimum scheduling interval: Nsubframes between the subframe E and the uplink subframe C is an uplinksubframe, the downlink subframe D is a downlink subframe that is on thefirst carrier and that is at time before time of the subframe E; or ifthe uplink subframe G and the uplink subframe C are spaced by more thanN subframes, and the subframe E, on the first carrier, satisfying theminimum scheduling interval: N subframes between the subframe E and theuplink subframe C is a downlink subframe, the downlink subframe D can bethe subframe E of the first carrier, or can also be a downlink subframethat is on the first carrier and that is at time before time of thesubframe E.

Taking a TDD system as an example, in consideration of the latency fromsending, by the base station, the UL_grant to sending, by the terminal,a corresponding PUSCH, at least four subframes are spaced by fromsending, by the base station, the UL-grant to sending, by the terminal,the corresponding PUSCH. As shown in FIG. 19B, the base station cansend, on any one downlink subframe on the first carrier, the UL-grantfor scheduling the uplink subframe 2 on the second carrier to theterminal, in which the downlink subframe is at time corresponding to theuplink subframe 2 on the second carrier, and the downlink subframe andthe uplink subframe 2 are at least spaced by four subframes. Forexample, the downlink subframe 6 on the first carrier and the uplinksubframe 2 on the second carrier are spaced by four subframes, and thetime of the downlink subframe 6 of the first carrier is before that ofthe uplink subframe 2 of the second carrier. Therefore, when the PDCCHof the second carrier is borne on the first carrier, the base stationcan send the UL-grant for scheduling the uplink subframe 2 on the secondcarrier to the terminal on the downlink subframe 6 on the first carrier.Also, for example, the downlink subframe 9 of the first carrier and theuplink subframe 2 on the second carrier are spaced by seven subframes,and the time of the downlink subframe 9 of the first carrier is beforethat of the uplink subframe 2 of the second carrier. Therefore, the basestation can also send the UL-grant for scheduling the uplink subframe 2on the second carrier to the terminal on the downlink subframe 9 of thefirst carrier.

As shown in FIG. 19B, when a subframe, on the first carrier, satisfyingthe minimum scheduling interval: four subframes between the subframe andthe uplink subframe 8 of the second carrier is the uplink subframe 4,and the PDCCH of the second carrier is borne on the first carrier, theUL-grant for scheduling the uplink subframe on the second carrier cannotbe sent to the terminal on the uplink subframe 4 of the first carrier.In consideration of the latency from sending, by the base station, theUL_grant to sending, by the terminal, a corresponding PUSCH, theUL_grant for scheduling the uplink subframe 8 of the second carrier canbe adjusted onto the downlink subframe 1 on the first carrier and beborne. The time of the downlink subframe 1 on the first carrier isbefore that of the uplink subframe 8 of the second carrier, and thedownlink subframe 1 and the uplink subframe 8 are spaced by eightsubframes, thereby satisfying the requirement of the minimum schedulinginterval: four subframes.

Further, the base station indicates an uplink subframe on the secondcarrier scheduled by the uplink scheduling information in across-carrier manner through a subframe indicator field in the uplinkscheduling information, so the terminal sends uplink data correspondingto the uplink scheduling information to the base station on acorresponding uplink subframe on the second carrier. The subframeindicator field includes at least one of a fifth value, a sixth value, aseventh value and an eighth value. Specifically, a bit can be newlyadded into the uplink scheduling information of the first carrier, andan uplink subframe, on the second carrier, on which the uplink datascheduled in a cross-carrier manner by the uplink scheduling informationon the first carrier is sent is indicated through the newly added bit.The newly added bit is referred to as a subframe indicator field (SIF).The first value included by the SIF can be 00, the second value includedby the SIF can be 01, the third value included by the SIF can be 10 andthe fourth value included by the SIF can be 11.

Taking a TDD system as an example, the SIF newly added into the PDCCHfor the uplink scheduling information is two bits, and because in theTDD system, time of four subframes at least needs to be spaced fromsending, by the base station, the uplink scheduling information tosending, by the terminal, corresponding uplink data to the base station,the value of the SIF corresponding to the uplink scheduling informationdenotes a time relationship between the uplink subframe C of the secondcarrier scheduled by the uplink scheduling information in across-carrier manner, and a subframe with the same time on the secondcarrier and of the downlink subframe D on the first carrier.

That the value of the SIF is 00 denotes that the uplink subframe C ofthe second carrier scheduled by the uplink scheduling information in across-carrier manner lags behind the time corresponding to the downlinksubframe D on the first carrier; that the value of the subframeindicator field SIF is 01 denotes that the uplink subframe C of thesecond carrier scheduled by the uplink scheduling information in across-carrier manner is the first uplink subframe lagging behind thereference subframe F on the second carrier, and the reference subframe Fon the second carrier lags behind the time corresponding to the downlinksubframe D on the first carrier by N subframes; that the value of thesubframe indicator field is 10 denotes that the uplink subframe C of thesecond carrier scheduled by the uplink scheduling information in across-carrier manner is the second uplink subframe lagging behind thereference subframe F on the second carrier; that the value of thesubframe indicator field is 11 denotes that the uplink subframe C of thesecond carrier scheduled by the uplink scheduling information in across-carrier manner is the third uplink subframe lagging behind thetime corresponding to the reference subframe F on the second carrier.

As shown in FIG. 19B, when the PDCCH of the second carrier is borne onthe first carrier, if the base station sends the UL-Grant for schedulingthe uplink subframe 2 on the second carrier and the UL-Grant forscheduling the uplink subframe 3 of the second carrier to the terminalon the downlink subframe 9 of the first carrier, the PDCCH of thedownlink subframe 9 of the first carrier includes two cross-carrierscheduling UL-Grants, in which the value of the SIF corresponding to theUL-Grant for scheduling the uplink subframe 3 of the first carrier inthe PDCCH is 11. The downlink subframe 5 of the second carrier lagsbehind the time corresponding to the downlink subframe 9 of the firstcarrier by four subframes, which are referred to as reference subframes.The uplink subframe 2 of the second carrier is the third uplink subframelagging behind a subframe with the same time of the first carrier and ofa reference subframe on the second carrier, so the value of the SIFcorresponding to the UL-Grant for scheduling the uplink subframe 3 ofthe first carrier in the PDCCH is 11.

As shown in FIG. 19B, the subframe, on the first carrier, satisfying theminimum scheduling interval: four subframes between the subframe and theuplink subframe 8 of the second carrier is the uplink subframe 4, andwhen the PDCCH of the second carrier is borne on the first carrier, inconsideration of the latency from sending, by the base station, theUL_grant to sending, by the terminal, a corresponding PUSCH, theUL_grant for scheduling the uplink subframe 8 of the second carrier isborne on the downlink subframe 1 on the first carrier. Furthermore, thetime of the downlink subframe 1 of the first carrier is before that ofthe downlink subframe 7 of the second carrier, and the downlink subframe1 and the downlink subframe 7 satisfy the requirement of the minimumscheduling interval: four subframes, and when the PDCCH of the secondcarrier is borne on the first carrier, the UL_grant for scheduling theuplink subframe 7 of the second carrier can be borne on the downlinksubframe 1 on the first carrier. Therefore, when the PDCCH of the secondcarrier is borne on the first carrier, the PDCCH of the downlinksubframe 1 of the first carrier includes two cross-carrier schedulingUL-Grants: a UL_grant for scheduling the downlink subframe 7 of thesecond carrier and a UL_grant for scheduling the uplink subframe 8 ofthe second carrier. The downlink subframe 5 of the second carrier lagsbehind the subframe with the same time on the second carrier and of thedownlink subframe 1 of the first carrier by four subframes, which arereferred to as reference subframes. The downlink subframe 7 of thesecond carrier is the second uplink subframe lagging behind thereference subframe on the second carrier, so the value of the SIF in theUL_grant of the downlink subframe 7 of the second carrier is set to 10;the downlink subframe 8 of the second carrier is the second uplinksubframe lagging behind the reference subframe on the second carrier, sothe value of the SIF in the UL_grant for scheduling the uplink subframe8 of the second carrier is set to 11.

Furthermore, the SIF newly added for the UL_grant in the PDCCH can alsobe three bits, and because in the TDD system, time of four subframes atleast needs to be spaced from sending, by the base station, the UL_grantto sending, by the terminal, the corresponding PUSCH to the basestation, valid values of the SIF are 100, 101, 110 and 111 at this time.

In the method for sending uplink scheduling information of theembodiment of the present invention, when a PDCCH on a second carrier isborne on a first carrier, and when a base station sends, on a downlinksubframe D on the first carrier, uplink scheduling informationcorresponding to an uplink subframe C on the second carrier to aterminal, the downlink subframe D can be the downlink subframe Esatisfying the minimum scheduling interval: N subframes between thedownlink subframe E and the uplink subframe C, or can also be before thedownlink subframe E; if a subframe satisfying the minimum schedulinginterval: N subframes between the subframe and the uplink subframe C isan uplink subframe, the downlink subframe D is before the subframesatisfying the minimum scheduling interval: N subframes between thesubframe and the uplink subframe C. Therefore, the base station cansend, on the first carrier, uplink scheduling information for schedulingthe PUSCH on the second carrier to the terminal, so as to solve thetechnical problem that when at time corresponding to the downlinksubframe for scheduling the uplink subframe C on the second carrierduring non-cross-carrier scheduling, a subframe on the first carrier isan uplink subframe, the base station schedules, on the first carrier,the uplink subframe C on the second carrier. Further, the base stationdetermines an uplink subframe on the second carrier scheduled by theuplink scheduling information in a cross-carrier manner through asubframe indicator field in the uplink scheduling information, so theterminal sends uplink data corresponding to the uplink schedulinginformation to the base station on a corresponding uplink subframe onthe second carrier.

FIG. 20 is a flow chart of Embodiment 2 of the method for receivinguplink scheduling information provided by the present invention. Asshown in FIG. 20, this embodiment includes the following steps.

Step 201: A terminal receives, on a downlink subframe D on a firstcarrier, uplink scheduling information, of an uplink subframe C on asecond carrier, sent by a base station, in which the interval betweenthe time corresponding to the subframe E on the first carrier and thetime corresponding to the uplink subframe C is the scheduling interval:N subframes, and if the subframe E is a downlink subframe, the downlinksubframe D and the subframe E are subframes with the same time, or thedownlink subframe D is before the subframe E; or if the subframe E is anuplink subframe, the downlink subframe D is before the subframe E; and Nis the number of subframes at least which are spaced by betweenreceiving, by a terminal, the uplink scheduling information and sending,by the terminal, the uplink data corresponding to the uplink schedulinginformation.

Step 202: The terminal sends uplink data corresponding to the uplinkscheduling information to the base station on the uplink subframe C onthe second carrier according to the received uplink schedulinginformation.

Further, the uplink scheduling information received by the terminalfurther includes a subframe indicator field, and the subframe indicatorfield corresponding to the uplink scheduling information is used toindicate, to the terminal, an uplink subframe on the second carrierscheduled by the uplink scheduling information in a cross-carriermanner. The terminal sends, on the uplink subframe C on the secondcarrier, the uplink data corresponding to the uplink schedulinginformation to the base station according to the uplink schedulinginformation and the subframe indicator field corresponding to the uplinkscheduling information.

In combination with FIG. 19B, when the PDCCH of the second carrier isborne on the first carrier, if the base station sends the UL-Grant forscheduling the uplink subframe 2 on the second carrier and the UL-Grantfor scheduling the uplink subframe 3 of the second carrier to theterminal on the downlink subframe 9 of the first carrier, the PDCCH ofthe downlink subframe 9 of the first carrier includes two cross-carrierscheduling UL-Grants. One UL-Grant is the UL-Grant for scheduling theuplink subframe 2 of the second carrier, the other UL-Grant is theUL-Grant for scheduling the uplink subframe 3 of the first carrier, andthe value of the SIF corresponding to the UL-Grant for scheduling theuplink subframe 3 of the first carrier in the PDCCH is 11. Whenreceiving, on the downlink subframe 9 of the first carrier, theUL-Grant, the value of the SIF of which is 11, the terminal determinesthe uplink subframe 2 of the second carrier scheduled by the UL-Grant isthe third uplink subframe lagging behind the time corresponding to areference subframe on the second carrier, and the terminal sends, on thethird uplink subframe lagging behind the time corresponding to thereference subframe on the second carrier, the PUSCH corresponding to theUL_grant to the base station. Here, the reference subframe on the secondcarrier is the downlink subframe 5 on the second carrier, which lagsbehind the time corresponding to the downlink subframe 9 of the firstcarrier by four subframes.

In combination with FIG. 19B, when the PDCCH of the second carrier isborne on the first carrier, the terminal receives, on the downlinksubframe 1 of the first carrier, two cross-carrier scheduling UL-Grants:a UL_grant for scheduling the downlink subframe 7 of the second carrierand a UL_grant for scheduling the uplink subframe 8 of the secondcarrier. The value of the SIF in the UL_grantH of the downlink subframe7 of the second carrier is set to 10, and the value of the SIF in theUL_grant for scheduling the uplink subframe 8 of the second carrier isset to 11. The downlink subframe 5 of the second carrier lags behind thetime corresponding to the downlink subframe 1 of the first carrier byfour subframes, which are referred to as reference subframes.

For the UL_grant whose SIF value is 10, the terminal can determine thatthe uplink subframe on the second carrier scheduled by the UL_grant isthe second uplink subframe lagging behind the time corresponding to areference subframe on the second carrier, and the reference subframe onthe second carrier lags behind the subframe with the same time on thesecond carrier and of the downlink subframe 1 on the first carrier byfour subframes, so the terminal sends, on the second uplink subframelagging behind the time corresponding to the reference subframe on thesecond carrier, the PUSCH corresponding to the UL_grant to the basestation.

For the UL_grant whose SIF value is 11, the terminal can determine thatthe uplink subframe on the second carrier scheduled by the UL_grant isthe third uplink subframe lagging behind the time corresponding to areference subframe on the second carrier, and the reference subframe onthe second carrier lags behind the subframe with the same time on thesecond carrier and of the downlink subframe 1 on the first carrier byfour subframes, so the terminal sends, on the third uplink subframelagging behind the time corresponding to the reference subframe on thesecond carrier, the PUSCH corresponding to the UL_grant to the basestation.

In the method for receiving uplink scheduling information of theembodiment of the present invention, when a PDCCH on a second carrier isborne on a first carrier, and when a base station sends, on a downlinksubframe D on the first carrier, uplink scheduling informationcorresponding to an uplink subframe C on the second carrier to aterminal, the downlink subframe D can be the downlink subframe Esatisfying the minimum scheduling interval: N subframes between thedownlink subframe E and the uplink subframe C, or can also be before thedownlink subframe E; if a subframe satisfying the minimum schedulinginterval: N subframes between the subframe and the uplink subframe C isan uplink subframe, the downlink subframe D is before the subframesatisfying the minimum scheduling interval: N subframes between thesubframe and the uplink subframe C. Therefore, the terminal can receive,on the first carrier, uplink scheduling information for scheduling thePUSCH on the second carrier, so as to solve the technical problem thatwhen at time corresponding to the downlink subframe for scheduling theuplink subframe C on the second carrier during non-cross-carrierscheduling, a subframe on the first carrier is an uplink subframe, theterminal receives, on the first carrier, the uplink schedulinginformation for scheduling the uplink subframe C on the second carrier.Further, the subframe indicator field in the uplink schedulinginformation is used to indicate an uplink subframe on the second carrierscheduled by the uplink scheduling information in a cross-carriermanner, and the terminal sends uplink data corresponding to the uplinkscheduling information to the base station on a corresponding uplinksubframe on the second carrier.

FIG. 21 is a schematic structural diagram of Embodiment 2 of theapparatus for sending downlink scheduling information provided by thepresent invention. As shown in FIG. 21, this embodiment includes: adownlink subframe determining module 211 and a downlink schedulingsending module 212.

The downlink subframe determining module 211 is configured to determine,in downlink subframes on a second carrier, a downlink subframe A.

The downlink scheduling sending module 212 is configured to send, on adownlink subframe B on a first carrier, downlink scheduling informationof the downlink subframe A on the second carrier to a terminal, in whichif a subframe on the first carrier at time the same as that of thedownlink subframe A on the second carrier is an uplink subframe, timecorresponding to the downlink subframe B is before the timecorresponding to the downlink subframe A; or if a subframe on the firstcarrier at time the same as that of the downlink subframe A on thesecond carrier is a downlink subframe, time corresponding to thedownlink subframe B is before the time corresponding to the downlinksubframe A, or time corresponding to the downlink subframe B is the sametime as the time corresponding to the downlink subframe A.

Further, the downlink scheduling information includes a subframeindicator field, and the subframe indicator field is used to indicatethe downlink subframe, scheduled by the downlink scheduling informationin a cross-carrier manner, on the second carrier. The subframe indicatorfield in the downlink scheduling information includes at least one of afirst value, a second value, a third value and a fourth value; the firstvalue is used to denote that the time corresponding to the downlinksubframe A of the second carrier and the time corresponding to thedownlink subframe B on the first carrier are the same; the second valueis used to denote that the downlink subframe A of the second carrier isthe first downlink subframe, of the subframes on the second carrier,which lags behind the time corresponding to the downlink subframe B onthe first carrier; the third value is used to denote that the downlinksubframe A of the second carrier is the second downlink subframe, of thesubframes on the second carrier, which lags behind the timecorresponding to the downlink subframe B on the first carrier; thefourth value is used to denote that the downlink subframe A of thesecond carrier is the third downlink subframe, of the subframes on thesecond carrier, which lags behind the time corresponding to the downlinksubframe B on the first carrier.

Furthermore, the downlink assignment indication in the downlinkscheduling information can also be used to indicate the downlinksubframe on the second carrier scheduled by the downlink schedulinginformation in a cross-carrier manner to the terminal. The specificindication method is the same as the subframe indicator field indicationmethod.

For working mechanisms of the modules, reference is made to descriptionin the embodiment corresponding to FIG. 17A, and no more details aregiven here.

FIG. 22 is a schematic structural diagram of Embodiment 3 of theapparatus for receiving downlink scheduling information provided by thepresent invention. As shown in FIG. 22, this embodiment includes: adownlink scheduling receiving module 221 and a downlink data receivingmodule 222.

The downlink scheduling receiving module 221 is configured to receive,on a downlink subframe B on a first carrier, downlink schedulinginformation, of a downlink subframe A on a second carrier, sent by abase station, in which if a subframe on the first carrier at time thesame as that of the downlink subframe A on the second carrier is anuplink subframe, time corresponding to the downlink subframe B is beforethe time corresponding to the downlink subframe A; or if a subframe onthe first carrier at time the same as that of the downlink subframe A onthe second carrier is a downlink subframe, time corresponding to thedownlink subframe B is before the time corresponding to the downlinksubframe A, or time corresponding to the downlink subframe B is the sametime as the time corresponding to the downlink subframe A.

The downlink data receiving module 222 is configured to receive, on thedownlink subframe A on the second carrier, downlink data correspondingto the downlink scheduling information according to the receiveddownlink scheduling information.

Further, the downlink scheduling information includes a subframeindicator field, and the subframe indicator field is used to indicatethe downlink subframe, scheduled by the downlink scheduling informationin a cross-carrier manner, on the second carrier, and the subframeindicator field at least includes at least one of a first value, asecond value, a third value and a fourth value. The downlink datareceiving module 222 is specifically configured to, if the value of thesubframe indicator field is the first value, receive, on a subframe onthe second carrier at time the same as the time corresponding to thedownlink subframe B on the first carrier, the downlink datacorresponding to the downlink scheduling information; if the value ofthe subframe indicator field is the second value, receive, on the firstdownlink subframe, on the first carrier, which lags behind the timecorresponding to the downlink subframe B on the first carrier, thedownlink data corresponding to the downlink scheduling information; ifthe value of the subframe indicator field is the third value, receive,on the second downlink subframe, on the first carrier, which lags behindthe time corresponding to the downlink subframe B on the first carrier,the downlink data corresponding to the downlink scheduling information;and if the value of the subframe indicator field is the fourth value,receive, on the third downlink subframe, on the first carrier, whichlags behind the time corresponding to the downlink subframe B on thefirst carrier, the downlink data corresponding to the downlinkscheduling information.

For working mechanisms of the modules, reference is made to descriptionin the embodiment corresponding to FIG. 18, and no more details aregiven here.

FIG. 23 is a schematic structural diagram of Embodiment 2 of theapparatus for sending uplink scheduling information provided by thepresent invention. As shown in FIG. 23, this embodiment includes: anuplink subframe determining module 231 and an uplink scheduling sendingmodule 232.

The uplink subframe determining module 231 is configured to determine,in uplink subframes on a second carrier, an uplink subframe C.

The uplink scheduling sending module 232 is configured to send, on adownlink subframe D on the first carrier, uplink scheduling informationof the uplink subframe C on the second carrier to a terminal, in whichthe interval between the time corresponding to the subframe E on thefirst carrier and the time corresponding to the uplink subframe C is thescheduling interval: N subframes, and if the subframe E is a downlinksubframe, the downlink subframe D and the subframe E are subframes withthe same time, or the downlink subframe D is before the subframe E; orif the subframe E is an uplink subframe, the downlink subframe D isbefore the subframe E; and N is the number of subframes at least whichare spaced by between receiving, by a terminal, the uplink schedulinginformation and sending, by the terminal, the uplink data correspondingto the uplink scheduling information.

Further, the uplink scheduling information includes a subframe indicatorfield, and the subframe indicator field indicates the uplink subframe,scheduled by the uplink scheduling information in a cross-carriermanner, on the second carrier to the terminal. The subframe indicatorfield in the uplink scheduling information includes at least one of afifth value, a sixth value, a seventh value and an eighth value; thefifth value is used to denote that the time corresponding to the uplinksubframe C of the second carrier lags behind the time corresponding tothe downlink subframe D on the first carrier are the same by Nsubframes; the sixth value is used to denote that the uplink subframe Cof the second carrier is the first uplink subframe, on the secondcarrier, which lags behind the time corresponding to the referencesubframe F on the second carrier, and the reference subframe F on thesecond carrier is a subframe, on the second carrier, which lags behindthe time corresponding to the downlink subframe D on the first carrierby N subframes; the seventh value is used to denote that the uplinksubframe C of the second carrier is the second uplink subframe, on thesecond carrier, which lags behind the time corresponding to thereference subframe F on the second carrier; the eighth value is used todenote that the uplink subframe C of the second carrier is the thirduplink subframe, on the second carrier, which lags behind the timecorresponding to the reference subframe F on the second carrier.

For working mechanisms of the modules, reference is made to descriptionin the embodiment corresponding to FIG. 19A, and no more details aregiven here.

FIG. 24 is a schematic structural diagram of Embodiment 3 of theapparatus for receiving uplink scheduling information provided by thepresent invention. As shown in FIG. 24, this embodiment includes: anuplink scheduling receiving module 241 and an uplink data sending module242.

The uplink scheduling receiving module 241 is configured to receive, ona downlink subframe D on a first carrier, uplink scheduling information,of an uplink subframe C on a second carrier, sent by a base station, inwhich the interval between the time corresponding to the subframe E onthe first carrier and the time corresponding to the uplink subframe C isthe scheduling interval: N subframes, and if the subframe E is adownlink subframe, the downlink subframe D and the subframe E aresubframes with the same time, or the downlink subframe D is before thesubframe E; or if the subframe E is an uplink subframe, the downlinksubframe D is before the subframe E; and N is the number of subframes atleast which are spaced by between receiving, by a terminal, the uplinkscheduling information and sending, by the terminal, the uplink datacorresponding to the uplink scheduling information.

The uplink data sending module 242 is configured to send, on the uplinksubframe C on the second carrier, uplink data corresponding to theuplink scheduling information according to the received uplinkscheduling information.

Further, the uplink scheduling information includes a subframe indicatorfield, and the subframe indicator field indicates the uplink subframe,scheduled by the uplink scheduling information in a cross-carriermanner, on the second carrier to the terminal. The subframe indicatorfield includes at least one of a fifth value, a sixth value, a seventhvalue and an eighth value. The uplink data sending module 242 isspecifically configured to, if the value of the subframe indicator fieldis the fifth value, send, on an uplink subframe, on the second carrier,which lags behind time corresponding to the downlink subframe D on thefirst carrier by N subframes, the uplink data corresponding to theuplink scheduling information to the base station according to thereceived uplink scheduling information; if the value of the subframeindicator field is the sixth value, send, on the first uplink subframe,on the second carrier, which lags behind time corresponding to areference subframe on the second carrier, the uplink data correspondingto the uplink scheduling information to the base station, in which thereference subframe on the second carrier lags behind the timecorresponding to the downlink subframe D on the first carrier by Nsubframes; if the value of the subframe indicator field is the seventhvalue, send, on the second uplink subframe, on the second carrier, whichlags behind time corresponding to a reference subframe on the secondcarrier, the uplink data corresponding to the uplink schedulinginformation to the base station; and if the value of the subframeindicator field is the eighth value, send, on the third uplink subframe,on the second carrier, which lags behind time corresponding to areference subframe on the second carrier, the uplink data correspondingto the uplink scheduling information to the base station.

For working mechanisms of the modules, reference is made to descriptionin the embodiment corresponding to FIG. 20, and no more details aregiven here.

Persons of ordinary skill in the art should understand that, all or partof the steps of the foregoing method embodiments may be implemented by aprogram instructing relevant hardware. The foregoing program may bestored in a computer readable storage medium. When the program is run,the foregoing steps included in the method embodiments are performed.The foregoing storage medium may be any medium capable of storingprogram codes, such as a ROM, a RAM, a magnetic disk, or an opticaldisk.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of the present inventionother than limiting the present invention. Although the presentinvention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solution described inthe foregoing embodiments or make equivalent replacements to sometechnical features thereof; without departing from the spirit and scopeof the technical solution of the embodiments of the present invention.

What is claimed is:
 1. A method for sending uplink schedulinginformation, comprising: sending, on a sixth downlink subframe on afirst carrier, uplink scheduling information corresponding to a firstuplink subframe on a second carrier to a terminal, wherein a timecorresponding to the sixth downlink subframe is prior to a timecorresponding to the first uplink subframe, wherein a subframe on thefirst carrier is an uplink subframe, a time corresponding to thesubframe is prior to the time corresponding to the first uplink subframeon the second carrier and spaced by a time interval needed forscheduling the first uplink subframe on the second carrier duringnon-cross-carrier scheduling, the time interval is at least 4 subframes.2. The method for sending uplink scheduling information according toclaim 1, wherein the sixth downlink subframe is one of a plurality ofdownlink subframes that a latency between the time corresponding to thesixth downlink subframe and the time corresponding to the first uplinksubframe on the second carrier is minimum compared to a latency betweenthe time corresponding to another of the plurality of downlink subframesand the time corresponding to the first uplink subframe on the secondcarrier, and the sixth downlink subframe and the first uplink subframeare spaced by at least N subframes, wherein the N is the number ofsubframes spaced between receiving, by the terminal, the uplinkscheduling information and sending, by the terminal, uplink datacorresponding to the uplink scheduling information; or at the timecorresponding to the sixth downlink subframe, a subframe on the secondcarrier does not bear the uplink scheduling information during thenon-cross-carrier scheduling.
 3. The method for sending uplinkscheduling information according to claim 1, wherein the sixth downlinksubframe bears uplink scheduling information corresponding to the firstuplink subframe on the second carrier.
 4. The method for sending uplinkscheduling information according to claim 1, further comprises:indicating a cross-carrier uplink scheduling type of the sixth downlinksubframe on the first carrier to the terminal through a newly added bit,a newly added scrambling code, a carrier indicator field, transmit powercontrol, a downlink assignment indication, or an uplink index in aphysical downlink control channel; or, indicating a cross-carrier uplinkscheduling type of the sixth downlink subframe on the first carrier tothe terminal through radio resource control signaling, media accesscontrol signaling, a search space of a physical downlink control channelor scheduling time of the physical downlink control channel.
 5. A methodfor receiving uplink scheduling information, comprising: on a sixthdownlink subframe that is on a first carrier and that is at a time priorto that of a first uplink subframe, receiving uplink schedulinginformation sent by a base station and is corresponding to the firstuplink subframe on a second carrier, wherein a subframe on the firstcarrier is an uplink subframe, a time corresponding to the subframe isprior to the time corresponding to the first uplink subframe on thesecond carrier and spaced by a time interval needed for scheduling thefirst uplink subframe on the second carrier during non-cross-carrierscheduling, the time interval is at least 4 subframes; and sending, onthe first uplink subframe on the second carrier, uplink datacorresponding to the uplink scheduling information according to thereceived uplink scheduling information.
 6. The method for receivinguplink scheduling information according to claim 5, wherein the sixthdownlink subframe is one of a plurality of downlink subframes that alatency between the time corresponding to the sixth downlink subframeand the time corresponding to the first uplink subframe on the secondcarrier is minimum compared to a latency between the time correspondingto another of the plurality of downlink subframes and the timecorresponding to the first uplink subframe on the second carrier, andthe sixth downlink subframe and the first uplink subframe are spaced byat least N subframes, wherein the N is the number of subframes spacedbetween receiving, by the terminal, the uplink scheduling informationand sending, by the terminal, uplink data corresponding to the uplinkscheduling information; or at the time corresponding to the sixthdownlink subframe, a subframe on the second carrier does not bear theuplink scheduling information during the non-cross-carrier scheduling.7. The method for receiving uplink scheduling information according toclaim 5, wherein the sixth downlink subframe bears uplink schedulinginformation corresponding to the first uplink subframe on the secondcarrier.
 8. The method for receiving uplink scheduling informationaccording to claim 5, further comprising: receiving a cross-carrieruplink scheduling type of the sixth downlink subframe, wherein thecross-carrier uplink scheduling type is indicated by a newly added bit,a newly added scrambling code, a carrier indicator field, transmit powercontrol, or an uplink assignment indication in a physical downlinkcontrol channel; or indicated by radio resource control signaling, mediaaccess control signaling, a search space of a physical downlink controlchannel or a scheduling time of the physical downlink control channel,wherein the sending, on the first uplink subframe on the second carrier,uplink data corresponding to the uplink scheduling information accordingto the received uplink scheduling information comprises: sending, on thefirst uplink subframe on the second carrier, the uplink datacorresponding to the uplink scheduling information according to thecross-carrier uplink scheduling type of the sixth downlink subframe andthe received uplink scheduling information.
 9. A non-transitorycomputer-readable medium storing computer executable instructions, whichwhen executed by a computer, cause an apparatus comprising the computerto execute a method comprising: sending, on a sixth downlink subframe ona first carrier, uplink scheduling information corresponding to a firstuplink subframe on a second carrier to a terminal, wherein a timecorresponding to the sixth downlink subframe is prior to a timecorresponding to the first uplink subframe, wherein a subframe on thefirst carrier is an uplink subframe, a time corresponding to thesubframe is prior to the time corresponding to the first uplink subframeon the second carrier and spaced by a time interval needed forscheduling the first uplink subframe on the second carrier duringnon-cross-carrier scheduling, the time interval is at least 4 subframes.10. The non-transitory computer-readable medium according to claim 9,wherein the sixth downlink subframe is one of a plurality of downlinksubframes that a latency between the time corresponding to the sixthdownlink subframe and the time corresponding to the first uplinksubframe on the second carrier is minimum compared to a latency betweenthe time corresponding to another of the plurality of downlink subframesand the time corresponding to the first uplink subframe on the secondcarrier, and the sixth downlink subframe and the first uplink subframeare spaced by at least N subframes, wherein the N is the number ofsubframes spaced between receiving, by the terminal, the uplinkscheduling information and sending, by the terminal, uplink datacorresponding to the uplink scheduling information; or at the timecorresponding to the sixth downlink subframe, a subframe on the secondcarrier does not bear the uplink scheduling information during thenon-cross-carrier scheduling.
 11. The non-transitory computer-readablemedium according to claim 9, wherein the sixth downlink subframe bearsuplink scheduling information corresponding to the first uplink subframeon the second carrier.
 12. The non-transitory computer-readable mediumaccording to claim 9, wherein the instructions further comprises:indicating a cross-carrier uplink scheduling type of the sixth downlinksubframe on the first carrier to the terminal through a newly added bit,a newly added scrambling code, a carrier indicator field, transmit powercontrol, a downlink assignment indication, or an uplink index in aphysical downlink control channel; or, indicating a cross-carrier uplinkscheduling type of the sixth downlink subframe on the first carrier tothe terminal through radio resource control signaling, media accesscontrol signaling, a search space of a physical downlink control channelor scheduling time of the physical downlink control channel.
 13. Anon-transitory computer-readable medium storing computer executableinstructions, which, when executed by a computer, cause an apparatuscomprising the computer to execute a method comprising: on a sixthdownlink subframe that is on a first carrier and that is at a time priorto that of a first uplink subframe, receiving uplink schedulinginformation sent by a base station and is corresponding to the firstuplink subframe on a second carrier, wherein a subframe on the firstcarrier is an uplink subframe, a time corresponding to the subframe isprior to the time corresponding to the first uplink subframe on thesecond carrier and spaced by a time interval needed for scheduling thefirst uplink subframe on the second carrier during non-cross-carrierscheduling, the time interval is at least 4 subframes; and sending, onthe first uplink subframe on the second carrier, uplink datacorresponding to the uplink scheduling information according to thereceived uplink scheduling information.
 14. The non-transitorycomputer-readable medium according to claim 13, wherein the sixthdownlink subframe is one of a plurality of downlink subframes that alatency between the time corresponding to the sixth downlink subframeand the time corresponding to the first uplink subframe on the secondcarrier is minimum compared to a latency between the time correspondingto another of the plurality of downlink subframes and the timecorresponding to the first uplink subframe on the second carrier, andthe sixth downlink subframe and the first uplink subframe are spaced byat least N subframes, wherein the N is the number of subframes spacedbetween receiving, by the terminal, the uplink scheduling informationand sending, by the terminal, uplink data corresponding to the uplinkscheduling information; or at the time corresponding to the sixthdownlink subframe, a subframe on the second carrier does not bear theuplink scheduling information during the non-cross-carrier scheduling.15. The non-transitory computer-readable medium according to claim 13,wherein the sixth downlink subframe bears uplink scheduling informationcorresponding to the first uplink subframe on the second carrier. 16.The non-transitory computer-readable medium according to claim 13, theinstructions further comprises: receiving a cross-carrier uplinkscheduling type of the sixth downlink subframe, wherein thecross-carrier uplink scheduling type is indicated by a newly added bit,a newly added scrambling code, a carrier indicator field, transmit powercontrol, or an uplink assignment indication in a physical downlinkcontrol channel; or the cross-carrier uplink scheduling type isindicated by radio resource control signaling, media access controlsignaling, a search space of a physical downlink control channel or ascheduling time of the physical downlink control channel; the sending,on the first uplink subframe on the second carrier, uplink datacorresponding to the uplink scheduling information according to thereceived uplink scheduling information comprises: sending, on the firstuplink subframe on the second carrier, the uplink data corresponding tothe uplink scheduling information according to the cross-carrier uplinkscheduling type of the sixth downlink subframe and the received uplinkscheduling information.